Numbers 7:87 in the King James Version
All the oxen for the burnt offering were twelve bullocks, the rams twelve, the lambs of the first year twelve, with their meat offering: and the kids of the goats for sin offering twelve.
Context
86 the twelve golden ladles, full of incense, weighing ten shekels apiece, according to the shekel of the sanctuary; all the gold of the ladles weighed one hundred twenty shekels;
87 all the cattle for the burnt offering twelve bulls, the rams twelve, the male lambs a year old twelve, and their meal offering; and twelve male goats for a sin offering;
88 and all the cattle for the sacrifice of peace offerings: twenty-four bulls, sixty rams, sixty male goats, and sixty male lambs a year old. This was the dedication offering of the altar, after it was anointed.