The principle known as the Golden Rule is honored in all religious traditions.

Baha'i
"Lay not on any soul a load which you would not wish to be laid upon you, and desire not for anyone the things ye would desire not for yourselves."
Gleanings, Baha'u'llah

Buddhism
"Hurt not others in ways that you yourself would find hurtful."
Undana-Varga 5:18

Christianity
"Do unto others as you would have them do unto you."
Leviticus 19:17

Confucianism
"Surely it is the maxim of loving-kindness: Do not unto others that you would not have them do unto you."
Analects XB.23

Hinduism
"This is the sum of all true righteous: deal with others as thou wouldst thyself be dealt by. Do nothing to thy neighbor which thou wouldst not have him do to thee after."
The Mahabharata

Islam
"No one of you is a believer until he desires for his brother that which he desires for himself."
Sumah

Judaism
"What is hateful to you, do not do to your fellow men. That is the entire Law, all the rest is commentary."
The Talmud, Shabbat, 31a

Sikhism
As thou deemest thyself, so deem others. Be not estranged from another for, in every heart, Pervades the Lord.
Sri Guru Granth Sahib

Taoism
"The Way of Heaven is to benefit and not cause any harm; the Way of Man is to act on behalf of others and not to compete with them."
Lao-Tzu: Te-Tao Ching

Zoroastrianism
"That nature only is good when it shall not do unto another whatever is not good for its own self."
Dadistan-i Dinik, 94:5