Numbers 10:2

10:2 “Make two trumpets of silver; you are to make them from a single hammered piece. You will use them for assembling the community and for directing the traveling of the camps.

Numbers 15:28

15:28 And the priest must make atonement for the person who sins unintentionally – when he sins unintentionally before the Lord – to make atonement for him, and he will be forgiven.