Avos 1:5 – Yossei the son of Yochanan of Jerusalem would say: Let your home be wide open, and let the poor be members of your household. And do not engage in excessive conversation with a woman. This is said even regarding one’s own wife–how much more so regarding the wife of another. Hence, the sages said: One who excessively converses with a woman causes evil to himself, neglects the study of Torah, and, in the end, inherits purgatory.