Buddhism:
Hurt not others in ways that you yourself would find hurtful - Udana-Varga 5,1
Christianity:
All things whatsoever ye would that men should do to you, do ye so to them; for this is the law and the prophets - Matthew 7:1
Confucianism:
Do not do to others what you would not like yourself. Then there will be no resentment against you, either in the family or in the state - Analects 12:2
Hinduism:
This is the sum of duty; do naught onto others what you would not have them do unto you - Mahabharata 5,1517
Islam:
No one of you is a believer until he desires for his brother that which he desires for himself - Sunnah
Jainism:
In happiness and suffering, in joy and grief, we should regard all creatures as we regard our own self.
Judaism:
What is hateful to you, do not do to your fellowman. This is the entire Law; all the rest is commentary - Talmud, Shabbat 3id
Sikhism:
As thou deemest thyself, so deem others.
Taoism:
Regard your neighbor’s gain as your gain, and your neighbor’s loss as your own loss - Tai Shang Kan Yin P’ien
Zoroastrianism:
That nature alone is good which refrains from doing another whatsoever is not good for itself - Dadisten-I-dinik, 94,5
Source: Love all people