BT Hag 10b(4) :ממאי דהאי וחגתם אתו חג לייי דיבחא הוא‏ : from what (do we know) that (the verse) וְחַגֹּתֶם חַג [Num 29:12] refers to a sacrifice?
See the entire entry for dḇaḥ, diḇḥā n.m. animal sacrifice