Rashi, on Gen 48:12

“And when Joseph had taken them from his father’s lap, he bowed down with his face to the ground.”

“ויוצא יוסף אתם AND JOSEPH BROUGHT THEM OUT — After he (Jacob) had kissed them, Joseph brought them out from between his knees in order to place them one at the right and the other on the left in order that Jacob might thus lay his hands upon them and bless them וישתחו לאפיו AND HE PROSTRATED HIMSELF BEFORE HIS FACE — after he had stepped backwards from before his father.”

Imported from an open dataset — not yet checked against the printed edition.