Every religion teaches the Law of Love

Every religion teaches the Law of Love.

Buddhism 

Hurt not others with that which pains yourself. Udanavarga 5.18.

Christianity 

Always treat others as you would like them to treat you; that is the Law and the Prophets. Bible, Matthew 7:12.

Confucianism 

Do not unto others what you would not they should do unto you. Analects 15.23. 

Hinduism 

This is the sum of duty: Do nothing to others which if done to you, would cause you pain. Mahabharata 5.1517.

Islam

No one of you is a believer until he loves for his brother what he loves for himself. Traditions.

Jainism

In happiness and suffering, in joy and grief, we should regard all creatures as we regard our own self, and should therefore refrain from inflicting upon others such injury as would appear undesirable to us if inflicted upon ourselves. Yogashastra 2.20.

Judaism

What is hurtful to yourself do not to your fellow man. That is the whole of the Torah and the remainder is but commentary. Go learn it. Talmud.

Sikhism

As you deem yourself so deem others. Then you will become a partner in partner to heaven. Kabir.

Taoism

Regard your neighbor's loss as your own loss. T'ai shang kan ying p'ien.