All must perform leaning, except for a deaf-mute, an imbecile, a minor, a blind man, a non-Jew, a slave, an agent, and a woman. Leaning is [considered] a remainder of the precept; [it is done] on the head, with two hands. In the place where the leaning is performed [the animal] is slaughtered, and the leaning immediately precedes the slaughtering.