He may separate his terumah and tithes with his knowledge, and he may sacrifice for him [the bird-offerings of zavin, zavos, and postpartum women, [and the] sin-offerings and guilt-offerings [of metzoraim].  He may teach him Midrash, Halachos, and Agga- dos, but he may not teach him Scripture; however, he may teach his sons and his daughters Scripture.  He may feed his wife and children, even though he is obligated in their sustenance.  However, he may not feed his animal, whether [it be] nonkosher or kosher. R' Eliezer says: He may feed the nonkosher one, but not the kosher one.  They said to him: What is the difference between a kosher and a nonkosher [animal]? He said to them: For the kosher one's soul belongs to heaven, but its body belongs to him; whereas the nonkosher one —- [both] its soul and body belong to heaven. They said to him: Even the nonkosher one —- its soul belongs to heaven, but its body belongs to him, for, if he wants, he can sell it to a non-Jew or feed it to dogs.