Genesis 17:3 - Wesley's Explanatory Notes

And Abram fell on his face while God talked with him — Either, As one overcome by the brightness of the Divine glory: Daniel and John did so likewise. Or. As one ashamed of himself, and blushing to think of the honours done to one so unworthy. He looks upon himself with humility, and upon God with reverence, and, in token of both, falls on his face.