Exodus 29:26-28

29:26 You are to take the breast of the ram of Aaron’s consecration; you are to wave it as a wave offering before the Lord, and it is to be your share. 29:27 You are to sanctify the breast of the wave offering and the thigh of the contribution, ¹  which were waved and lifted up as a contribution from the ram of consecration, from what belongs to Aaron and to his sons. 29:28 It is to belong to Aaron and to his sons from the Israelites, by a perpetual ordinance, for it is a contribution. It is to be a contribution from the Israelites from their peace offerings, their contribution to the Lord.

Leviticus 7:31-34

7:31 and the priest must offer the fat up in smoke on the altar, but the breast will belong to Aaron and his sons. 7:32 The right thigh you must give as a contribution offering ²  to the priest from your peace offering sacrifices. 7:33 The one from Aaron’s sons who presents the blood of the peace offering and fat will have the right thigh as his share, 7:34 for the breast of the wave offering and the thigh of the contribution offering I have taken from the Israelites out of their peace offering sacrifices and have given them to Aaron the priest and to his sons from the people of Israel as a perpetual allotted portion.’” ³ 

[29:27]  ¹ sn These are the two special priestly offerings: the wave offering (from the verb “to wave”) and the “presentation offering” (older English: heave offering; from a verb “to be high,” in Hiphil meaning “to lift up,” an item separated from the offering, a contribution). The two are then clarified with two corresponding relative clauses containing two Hophals: “which was waved and which was presented.” In making sacrifices, the breast and the thigh belong to the priests.

[7:32]  ² tn Older English versions (e.g., KJV, ASV) translate this Hebrew term (תְּרוּמָה, tÿrumah) “heave offering,” derived from the idea of “to raise, to lift” found in the verbal root (cf. NAB “a raised offering”). “Contribution offering” is a better English rendering because it refers to something “taken out from” (i.e., “lifted up from”; cf. the Hebrew term הֵרִים (herim) in, e.g., Lev 2:9; 4:8, etc.) the offering as a special contribution to the specific priest who presided over the offering procedures in any particular instance (see the next verse and R. E. Averbeck, NIDOTTE 4:335-37). Cf. TEV “as a special contribution”; NCV, NLT “as a gift.”

[7:34]  ³ tn Or “a perpetual regulation”; cf. NASB “as their due forever”; NRSV “as a perpetual due”; NLT “their regular share.”