He is said to be a teacher of the Atharva-Veda. It was Saunaka, who established the distinctions of the four castes. Regarding Atharva-Veda it is said that the prayer which in older Veda is the instrument of devotion is here rather the tool of superstition. The most prominent feature of this Veda is the multitude of incantations which it contains. The Sikh Scripture is critical about the observance of omens.
References :
1. Kohli,Surindar Singh ed,Dictionary of Mythological References in Guru Granth Sahib 1993