And Abram fell on his face: and God talked with him, saying,

Wesley's Notes

17:3 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.

Jamieson-Fausset-Brown Bible Commentary

3. Abram fell on his face-the attitude of profoundest reverence assumed by Eastern people. It consists in the prostrate body resting on the hands and knees, with the face bent till the forehead touches the ground. It is an expression of conscious humility and profound reverence.

Matthew Henry's Concise Commentary

17:1-6 The covenant was to be accomplished in due time. The promised Seed was Christ, and Christians in him. And all who are of faith are blessed with faithful Abram, being partakers of the same covenant blessings. In token of this covenant his name was changed from Abram, a high father, to Abraham, the father of a multitude. All that the Christian world enjoys, it is indebted for to Abraham and his Seed.