Exodus 33:21-23

Jehovah accordingly bids Moses stand where he may see, as He passes by, not His full glory, but only His back, or hinder parts (Exodus 26:12 Heb.), i.e., so to say, only the afterglow, which He leaves behind Him, but which may still suggest faintly what the full brilliancy of His presence must be (cf. Job 26:14).