Charles Ellicott Commentary Deuteronomy 3:2

"And Jehovah said unto me, Fear him not; for I have delivered him, and all his people, and his land, into thy hand; and thou shalt do unto him as thou didst unto Sihon king of the Amorites, who dwelt at Heshbon." — Deuteronomy 3:2 (ASV)

And the Lord said unto me... —This verse repeats Numbers 21:34.

For I will deliver him should rather be read as follows: for into thy hand have I delivered him.