Numbers 16:2

16:2 and rebelled against Moses, along with some of the Israelites, 250 leaders of the community, chosen from the assembly, famous men.

Numbers 16:17

16:17 And each of you take his censer, put incense in it, and then each of you present his censer before the Lord: 250 censers, along with you, and Aaron – each of you with his censer.”