Genesis 33:3

And he passed over before them, and bowed himself to the ground seven times, in the Oriental manner, in which men stoop over forward until their forehead practically touches the ground, a sign of the deepest reverence, until he came near to his brother. The six fold repetition of the deep obeisance was a form of humiliation which indicated that he wanted to atone fully for any offense against his brother Esau, that he was willing to show him the utmost reverence.