For a person to belong to another person is a very foreign and perhaps even abhorrent notion today. But it was a normal part of ancient cultures. For instance
Often a man who had taken on debt and could not pay it off was forced to sell himself or one of his family members to the creditor as a debt-slave. No actual “sale” took place, but the person was transferred into the possession of the creditor. The “sale price” was understood to be a loan, which the debtor had already received and was now unable to repay. Redemption occurred when the debtor or one of his family members eventually acquired the means to pay off the debt and thereby retrieve the debt-slave from the creditor. To redeem a person was, in a sense, the act of buying the person back from the creditor, often at the same price (the amount of the loan) at which the person was “sold.” (NRSV, Cultural Backgrounds Study Bible)
Even though we may be uncomfortable with it, the common scriptural idea of being the Lord's people and belonging to him is best understood in this context. A lot of this can be traced back to the Exodus.
The LORD said to Moses: Consecrate to me all the firstborn; whatever is the first to open the womb among the Israelites, of human beings and animals, is mine...When in the future your child asks you, ‘What does this mean?’ you shall answer, ‘By strength of hand the LORD brought us out of Egypt, from the house of slavery. When Pharaoh stubbornly refused to let us go, the LORD killed all the firstborn in the land of Egypt, from human firstborn to the firstborn of animals. Therefore I sacrifice to the LORD every male that first opens the womb, but every firstborn of my sons I redeem. (Exodus 13:1-2, 14-15)
Apparently, the Israelites were indebted to Yahweh for sparing their firstborn right before they left Egypt. We remember that they were spared as long as the blood of the lamb was stricken on the door posts. But as stated in Exodus 13, they would now belong to the Lord. The firstborn animals were therefore sacrificed to him, but the firstborn human male would be "redeemed", that is, an animal could be sacrificed in his place, just like a redeemer could pay the debt of someone else according to ancient practice. Later on, the firstborn are replaced or "redeemed" by the Levites.
I hereby accept the Levites from among the Israelites as substitutes for all the firstborn that open the womb among the Israelites. The Levites shall be mine, for all the firstborn are mine; when I killed all the firstborn in the land of Egypt, I consecrated for my own all the firstborn in Israel, both human and animal; they shall be mine. I am the LORD. (Numbers 3:12-13)
In Numbers 8, there is a formal consecration of the Levites as substitutes for all the firstborn belonging to the Lord. In verses 6-12, the Levites are commanded to wash themselves, offer a sin offering, go to the tabernacle to be brought before the Lord, and have Israel lay their hands on their heads. Then the Levites are to be offered as an offering to the Lord!
13Then you shall have the Levites stand before Aaron and his sons, and you shall present them as an elevation offering to the LORD. Thus you shall separate the Levites from among the other Israelites, and the Levites shall be mine. (Numbers 8:13-14)
Fortunately, unlike many other cultures at the time, human sacrifice was strictly forbidden under Mosaic law. Instead of the Levites being slain and burned on the altar, animals again "redeem" them or are sacrificed in their place. But the "elevation offering" is interesting. It has different translations in different Bible versions, but here is an explanation
The Hebrew word translated “elevation offering” denotes a type of offering that is lifted up toward the heavens in presentation and dedication to God and then lowered into the hands of the priest. This practice is evidenced in Egyptian and Mesopotamian ritual offerings pictured on monuments, steles and plaques. Often the breast or right thigh of the animal was uplifted as an elevation offering. In Israel, the elevation offering was associated with the well-being offering (here; v. 34; 23.20), the consecration of the priests (8.29; Ex 29.27), the dedication of the Levites (Num 8.11– 13, 21), and the purification ritual for Nazirites (Num 6.19– 20). In Lev 10.15, the “thigh that is raised” (that is, moved upward) and the “breast that is elevated” (in Hebrew, moved from side to side) were ordained as gifts for the Aaronic priesthood. Grain and oil offerings were also presented in such fashion, as with the consecration of the priests (8.27; Ex 29.23– 24), cleansing ritual for lepers (Lev 14.12, 21, 24) and the sheaf of grain and two loaves for the festival of weeks (23.15,17). The transference ritual of up and down, forward and backward movement signified that the offering was moving from its temporary owner to its ultimate owner, God. (emphasis added)
I don't know what that would have looked like for the Levites who were presented as an elevation offering to the Lord in the tabernacle, but I can imagine them waving or making some gesture towards heaven to indicate that they now belong to Yahweh as his property. After this they are ready to officiate in the tabernacle.
Levites also served as guardians of the sanctuary and constituted the first level of human presence in proximity to the tabernacle according to detailed encampment instructions for Israel in a "concentric circles of holiness" arrangement. I will not go into details here as Lord Wilmore soon will write more about that. But in their function they provided a constant visible presence among the 12 tribes to remind them of the need for holiness and righteousness as God's people. This was also the case when Israel finally obtained the promised land and each tribe has a designated inheritance. The Levites had no such designated portion of the land but lived among the other tribes serving as priests and facilitated the rendering of the tithes by Israel, among other things. Instead of land, the Levites inherited the Lord!
Then the LORD said to Aaron: You shall have no allotment in their land, nor shall you have any share among them; I am your share and your possession among the Israelites. (Numbers 18:20)
Levites, who have been dedicated to Yahweh as his possession now inherit him in return in a reciprocal relationship. The idea of God being our possession is not as usual in the scriptures as the other way around, but the closely related idea of inheriting everything our Father has, is very important in Latter-day Saint theology. The promised land is obviously a symbol of the heavenly destination that we all seek. What I also like about this, is how the Levites were first consecrated to God and served among Israel to bring them to God for his possession too, so they eventually could inherit him by "entering into his rest". This is a type and example for priesthood holders today.
In order to avoid turning this into an Old Testament blog, I will close by sharing a Book of Mormon scripture beautifully conveying these ideas.
17 And blessed art thou because thou hast established a among this people; and they shall be established, and they shall be my people.
18 Yea, blessed is this people who are willing to bear my ; for in my shall they be called; and they are mine.
19 And because thou hast inquired of me concerning the transgressor, thou art blessed.
20 Thou art my servant; and I covenant with thee that thou shalt have ; and thou shalt serve me and go forth in my name, and shalt gather together my sheep.
There are the Lord's words to Alma-1. It is not stated here, but we know that his people were in bondage and God redeemed them. Perhaps this is one of the reasons for the Lord now claiming them as his. Belonging to God as his possession is not a bad thing though, even if it can sound like it to modern ears. When Alma in this capacity serves in His name and gathers His sheep, he gets eternal life in return.