LEV787 Treat Scholars with Respect: it is a duty to treat every scholar with respect, even though he is not one's teacher, for it is written [this verse] the word zaken (old) refers here to one who has acquired wisdom. When are we required to stand up in his presence? From the moment he reaches one within six feet till he has passed alongside him. It is improper for a scholar to put the people to the trouble of standing up in his presence by deliberately passing before them. He should rather use a shorter route, tending to avoid notice, so that none will have to rise before him. [Maimonides, Mishneh Torah, Laws of Talmud Torah, 6:1, 6:3].