Do not do to others what you do not want them to do to you. (Rabbi Hillel, Shabbat 31a)
You should love your neighbour as yourself.
(Leviticus 19:18)
The stranger who resides with you shall be to you as the citizen among you; you shall love the stranger as yourself.
(Leviticus 19:34)
Which of you desires life, and covets many days to enjoy good?
Keep your tongue from evil, and your lips from speaking deceit.
Depart from evil, and do Good; seek peace and pursue it.
(Psalm 34:13–15)
When a man appears before the throne of Judgment, the first question he is asked is not:
Have you believed in God? or, Have you prayed and fulfilled the precepts? but, Have you dealt honourably, faithfully in all your dealings with your neighbour?
(Talmud, Shabbat 31a)
The world rests on three things: on justice, truth and peace.
(Talmud, Avot 1.18)
You may modify a statement in the interests of peace.
(Talmud, Yebamot 65b)
It may not be granted you to complete the work, but you are not free to withdraw from it.
(Talmud, Avot 2.21)