Rashi on Genesis 42:15/רש"י על בראשית מ״ב:ט״ו

1חי פרעה BY THE LIFE OF PHARAOH — If Pharaoh lives! Whenever he swore for the sake of appearance (literally, falsely) he swore by Pharaoh’s life (Genesis Rabbah 91:7).

2אם תצאו מזה YE SHALL NOT GO FORTH FROM THIS i.e. from this place.