Albert Barnes Commentary 1 Chronicles 29:21

"And they sacrificed sacrifices unto Jehovah, and offered burnt-offerings unto Jehovah, on the morrow after that day, even a thousand bullocks, a thousand rams, and a thousand lambs, with their drink-offerings, and sacrifices in abundance for all Israel," — 1 Chronicles 29:21 (ASV)

With their drink offerings - that is, with the drink-offerings appropriate to each kind of burnt-offering and required by the Law to accompany them (see Numbers 15:5, 7, 10, and following).

Sacrifices - or, “thank-offerings,” as the same word is translated in 2 Chronicles 29:31 and 33:16. Of “peace-offerings for thanksgivings,” only a small part was the priest’s; the sacrificer and his friends feasted on the remainder (Leviticus 7:15, 29, 34).