Exodus 28:35

28:35 The robe is to be on Aaron as he ministers, and his sound will be heard when he enters the Holy Place before the Lord and when he leaves, so that he does not die.

Exodus 32:34

32:34 So now go, lead the people to the place I have spoken to you about. See, my angel will go before you. But on the day that I punish, I will indeed punish them for their sin.”