Purananuru -166 says Nandru aintha NinimirSadai Muthumuthalvan Vaipoka Thondru Purintha Virirandin Arunarntha Oru MuthuNool PURAM 166: 1-4 This is the reference to God Siva giving Vedas - Rig,Yajur, Sama and Athrva to Munivarkal and this is also confirmed by Tholkappiyam and Tirukural