John Gill

And now, behold, I have brought the firstfruits of the land, which thou, O Lord, hast given me,.... Directing his speech not to the priest, but to the Lord himself; owning that the part of the land he had, and the fruits he enjoyed, were the gifts of God to him, and therefore, as in gratitude bound, brought him the firstfruits: and thou shalt set it before the Lord thy God; these are the words of Moses, or of the law, directing the man what further he had to do; and this, as Jarchi thinks, shows that he took it after the priest waved it, and laid hold on it with his hand while he was reading (his confession), turning and waving: and worship before the Lord thy God; bow before him in a reverend and humble manner, sensible of his obligations to him, and dependence on him.