The scriptures of the Vedic code of conduct, Dharma. Manusmriti, the law of Manu, is the most famous treatise.
Apastamba, Baudhayana, Gautama, Vasishtha are each considered to be the author of a Dharmashastra, a textbook on Dharma
Read Manusmriti here
https://www.sacred-texts.com/hin/manu.htm