Exodus 33:21-23 NIV

21 Then the LORD said, "There is a place near me where you may stand on a rock.
22 When my glory passes by, I will put you in a cleft in the rock1 and cover you with my hand2 until I have passed by.

References for Exodus 33:22

23 Then I will remove my hand and you will see my back; but my face must not be seen."