Numbers 7:87

7:87 All the animals for the burnt offering were 12 young bulls, 12 rams, 12 male lambs in their first year, with their grain offering, and 12 male goats for a purification offering.

Numbers 11:11

11:11 And Moses said to the Lord, “Why have you afflicted your servant? Why have I not found favor in your sight, that you lay the burden of this entire people on me?

Numbers 17:6

17:6 So Moses spoke to the Israelites, and each of their leaders gave him a staff, one for each leader, according to their tribes – twelve staffs; the staff of Aaron was among their staffs.

Numbers 28:2

28:2 “Command the Israelites: ‘With regard to my offering, be sure to offer my food for my offering made by fire, as a pleasing aroma to me at its appointed time.’