John Gill Commentary Deuteronomy 26:4

"And the priest shall take the basket out of thy hand, and set it down before the altar of Jehovah thy God." — Deuteronomy 26:4 (ASV)

And the priest shall take the basket out of your hand To wave it, as Jarchi says, putting his hand under the hand of the owner, and so waving it; and this being waved to and fro towards the several corners of the earth, was an acknowledgment of the Lord being the proprietor of it:

and set it down before the altar of the Lord your God ; that it might have some appearance of a sacrifice, and be a fit emblem of the spiritual sacrifice of praise, which is accepted upon the altar Christ, which sanctifies every gift.