"Never enter a neighbor’s house unwarned." ~~ Derekh Eretz R.
"If you do a man a favor, do not regard it as a debt he must repay!" ~~ Mishle Shua’lim
"Who eats even plain bread and salt with his friend should be grateful to him." ~~ Tanna Deve Eliyahu R.
"The Torah teaches incidentally good manners." ~~ Ishmael b. Elisha
"My son, answer not before you hear, nor speak in the midst of converse!" ~~ Ben Sira 11:8
"Do not offer your food to one who has no appetite for it!" ~~ Mivchar Hapeninim
"Without manners no Torah, without Torah no manners." ~~ Eleazar b. Azariah, Mishna: Avot
"Good manners is thoughtfulness of God and of men." ~~ Jehiel Anav
"Do not be joyful almong the mourners!" ~~ Mishle Agur
"In the midst of a discourse, speak not." ~~ Apocrypha: Ben Sira
"If a guest enters your home, ask him no quesitons of the Torah unless you know that he can answer! " ~~ Sefer Chassidim
"A man should not drink from a glass and then give it to another." ~~ Derekh Eretz R.