Leviticus was written c 550-400 BC, not 1000 BC as claimed. From wikipedia: According to traditional belief, Leviticus is the word of Yahweh, dictated to Moses from the Tent of Meeting before Mount Sinai. Since Julius Wellhausen formulated the documentary hypothesis in the late 19th century biblical scholars have regarded Leviticus as being almost entirely a product of the priestly source, originating amongst the Aaronid priesthood c 550-400 BC. Leviticus consists of several layers of laws. The base of this accretion is the Holiness Code, regarded as an early independent document with a faint relationship with the Covenant Code presented earlier in the bible.
Wellhausen regarded the Priestly source as a later, rival, version of the stories contained within JE, the Holiness Code thus being the law code that the priestly source presented as being dictated to Moses at Sinai, in the place of the Covenant Code. Different writers inserted laws, some from earlier independent collections. These additional laws, in critical scholarship, are those which subsequently formed the Priestly Code, and thus the other portion of Leviticus. Macedonian 12:05, 13 March 2008 (UTC)
Islam quote to add; unsure how to cite
"None of you will believe until you love for your brother what you love for yourself"
Hadith 13 from ahadith Nawawi 
- आत्मनः प्रतिकूलानि परेषां न समाचरेत्
- That which is hurting oneself should not be done to others.
Said to be from Panchatantra, I have not confirmed this.