Leviticus 9:23

‘And Moses and Aaron went into the tent of meeting, and came out, and blessed the people, and the glory of Yahweh appeared to all the people.'

Moses and Aaron, the veteran and the new boy, then went into the Holy Place through the entrance curtain. But we are told nothing of what they did. Perhaps Moses was showing to Aaron all the different furniture in the Holy Place with which he would have to be familiar, for it was he who had set them up (Exodus 40:18; Exodus 40:33). But this was known only to themselves. The person who is recording what happened had no knowledge of what occurred within the tent, and therefore merely says, ‘they went in -- and came out'. What better evidence could we have that these are the words of an eyewitness. Such subtlety would have been beyond an inventor.

On coming out they once again blessed the people. And then as promised the glory of Yahweh appeared to all the people. The One Who had led them up to this point, Who had appeared to them in a pillar of cloud and fire, Who had revealed His glory on Mount Sinai, Whose glory at this time filled the tent of meeting (Exodus 40:34), now let His glory break forth through the cloud that covered the tent of meeting, and so that He could appear before all the people. They beheld the glory of God. But even so it was no doubt through the cloud, or else they would have been unable to bear it.