"and he bowed down to him and he kissed him": I would not know who bowed down to whom or who kissed whom, were it not written (Ibid.) "And they greeted, a man, his neighbor, in peace." Who is called "a man"? Moses, as it is written (Numbers 12:3) "And the man, Moses, was exceedingly humble." It was Moses, then, who bowed down to his father-in-law and kissed him. From here they ruled that a man should be solicitous of the honor his father-in-law. "and they came into the tent": the house of study.