BhagavdGita

The Bhagavad Gita is a sacred conversation between Lord Krishna and Prince Arjuna, a friend of Krishna's, on the battlefield of Kurukshetra. The conversation takes place before the start of the great war of Mahabharata.
The Bhagavad Gita is a dialogue between Prince Arjuna and Krishna, an avatar (incarnation) of the god Vishnu. The conversation takes place in chapters 23 to 40 of Book VI of the Mahabharata, an Indian epic. The date of its composition is associated with that of the epic, around 5th-3rd century BCE.
The Bhagavad Gita presents a synthesis of various Hindu ideas about dharma, theistic bhakti, and the yogic ideal of moksha. The text covers Jñāna, Bhakti, Karma, and Rāja yogas, while incorporating ideas from the Samkhya-Yoga philosophy.
Some moral principles of the Bhagavad Gita include:
Practicing austerity in every way
Bodily austerity means not talking nonsense and not eating meat
Mental austerity means restraining the force of lust, anger, and greed
Treating others the way one would treat oneself