Numbers 6:20 (BSB)

The priest shall then wave them as a wave offering before the LORD. This is a holy portion for the priest, in addition to the breast of the wave offering and the thigh that was presented. After that, the Nazirite may drink wine.

From Numbers 6. Also in the ESV.

Commentary on Numbers 6:20

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on Numbers 6:1-21: After the law for the discovery and shame of those that by sin had made themselves vile, fitly follows this for the direction and encouragement of those who by their eminent piety and devotion had made themselves honourable, and distinguished themselves from their neighbours.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on Numbers 6:20: This is the law of the Nazarite, who hath vowed,.... The vow of a Nazarite; what he is obliged to do when his Nazariteship is up: and of his offering unto the Lord for his separation; of the several offerings required of him, to offer to the Lord, for and upon his going through his Nazariteship, his burnt offering, sin offering, sacrifice of peace offerings...
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Numbers 6:19-20: Num 6:19-20 When this had been done, the priest took the boiled shoulder of the ram, with an unleavened cake and wafer out of the basket, and placed these pieces in the hands of the Nazarite, and waved them before Jehovah.