Numbers 18:20
18 And their meat will be yours, just as the breast and the right hip of the raised offering is yours. 19 All the raised offerings of the holy things that the Israelites offer to the Lord, I have given to you, and to your sons and daughters with you, as a perpetual ordinance. It is a covenant of salt forever before the Lord for you and for your descendants with you.” 20 The Lord spoke to Aaron, “You will have no inheritance in their land, nor will you have any portion of property among them—I am your portion and your inheritance among the Israelites. 21 See, I have given the Levites all the tithes in Israel for an inheritance, for their service that they perform—the service of the tent of meeting. 22 No longer may the Israelites approach the tent of meeting, or else they will bear their sin and die.
Psalm 16:5
3 As for God’s chosen people who are in the land, and the leading officials I admired so much— 4 their troubles multiply; they desire other gods. I will not pour out drink offerings of blood to their gods, nor will I make vows in the name of their gods. 5 The Lord is the portion of my possession and my cup9; you make my future secure. 6 It is as if I have been given fertile fields or received a beautiful tract of land. 7 I will praise the Lord who guides me; yes, during the night my kidneys instruct me15.
Notes and References
"... Psalm 16:5-6: The next four verses comprise a stanza of trust and a stanza of praise, both of which function as the psalmist’s confession of faith. In the trust-filled verses 5-6, the psalmist piles up a series of technical terms that draw one to conclude that the psalmist is a Levitical priest: portion, lot, boundaries, and inheritance describe the distribution of the land among God’s people. The tribe of Levi, notably, was given no land as its inheritance; the tithes and offerings of the land (Leviticus 6:16-18) and the Lord (Numbers 18:20) are described as their portion (on the distribution of the land, see also Joshua 13:14, 33; 14:4). The term cup symbolizes the abundance of God’s gifts (compare Psalm 23:5) and also indicates Israel’s ritual thanksgiving celebrations (compare Psalm 116:13). The term makes one think of the ritual duties of a priest, as does the reference in verse 4 to the psalmist refusing to pour out their drink offerings of blood ..."
DeClaissé-Walford, Nancy L. The Book of Psalms (p. 220) William B. Eerdmans Publishing Company, 2014