"Whosoever is not instructed in Scripture, in the Mishna, and in good
manners," says Rabbi Yochanan, "is not qualified to act as a witness."
"He who eats in the street," say the Rabbis, "is like a dog;" and some
add that such a one is ineligible as a witness, and Rav Iddi bar Avin
says the Halachah is as "some say."
THE TALMUD, _Kiddushin_, fol. 40, col. 2.