Thou shalt not avenge, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am the LORD.
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Leviticus 19:16-20
Tyndale Open Study Notes (CC BY-SA 4.0).
19:18 love your neighbor as yourself: This is the cornerstone for biblical ethics in both the Old Testament and the New Testament (see Matt 22:39; Mark 12:31; Luke 10:27; Rom 13:8-9; Gal 5:14; Jas 2:8). It includes foreigners (Lev 19:34; cp. Luke 10:30-37). Conversely, hate leads to a grudge that can bear violent fruit (see 1 Jn 2:10-11; 4:20).
Other Bible passages linked to this one, most cited first.
And the second is like unto it, Thou shalt love thy neighbour as thyself. On these two commandments hang all the law and the prophets.
For this, Thou shalt not commit adultery, Thou shalt not kill, Thou shalt not steal, Thou shalt not bear false witness, Thou shalt not covet; and if there be any other commandment, it is briefly comprehended in this saying, namely, Thou shalt love thy neighbour as thyself.
And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these. And the scribe said unto him, Well, Master, thou hast said the truth: for there is one God; and there is none other but he: And to love him with all the heart, and with all the understanding, and with all the soul, and with all the strength, and to love his neighbour as himself, is more than all whole burnt offerings and sacrifices.
And he answering said, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy strength, and with all thy mind; and thy neighbour as thyself. And he said unto him, Thou hast answered right: this do, and thou shalt live. But he, willing to justify himself, said unto Jesus, And who is my neighbour?
For all the law is fulfilled in one word, even in this; Thou shalt love thy neighbour as thyself.
If ye fulfil the royal law according to the scripture, Thou shalt love thy neighbour as thyself, ye do well:
Authorship: the book itself or Christian tradition. Approximate dates, as in Carson and Moo, An Introduction to the New Testament, and Longman and Dillard, An Introduction to the Old Testament.