1 Kings 19:13
ESV - 13 And when Elijah heard it, he wrapped his face in his cloak and went out and stood at the entrance of the cave. And behold, there came a voice to him and said, "What are you doing here, Elijah?
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I just love how God did allow them to see His face when they were on the mount during the transfiguration of Jesus.
In John 14:9 Jesus said, "Anyone who has seen me, has seen the father." What an awesome revelation that the 2 prophets who had to cover their face got to see Jesus in the flesh. What a blessing for all of us to know, one day we will get to see His face as well!