The Vedas
The knowledge about the Supreme Being or Brahman and Dharma have been handed down from one generation to the next in the form of scriptures and are known as the Vedas. By virtue of his tapas in the previous kalpa, Rudra created a new Brahma for the Swetavaraha Kalpa (the present Kalpa) to create a new Universe. Brahma had forgotten the Order of creation and performed penance. Rudra appeared before him and taught him the technique and order of creation.
Shruti
Bhagavad Gita
Smriti