Numbers 13:2

13:2 “Send out men to investigate the land of Canaan, which I am giving to the Israelites. You are to send one man from each ancestral tribe, each one a leader among them.”

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.