The one tenet almost every religion has in common is to Love one another. A simple rule, yet so difficult to follow.
While the various religions and faith paths have said this in many ways, the meaning is the same. Here are some sacred writings from around the world. These are listed by the approximate dates they were written based on texts found by scholars.
Hinduism: 3200 BC, From the Hitopadesa - "One should always treat others as they themselves wish to be treated."
Judaism: 1300 BC, from the Old Testament, Leviticus 19:18 - "Thou shalt Love thy neighbor as thyself." Zoroastrianism: 600 BC, From the Shast-na-shayast 13:29 - "Whatever is disagreeable to yourself, do not do unto others."
Confucianism: 557 BC, From the Analects 15:23 - "What you do not want done to yourself, do not do to others." Buddhism: 560 BC, From the Udanavarga 5:18 …