ཕྱག་གཡས་ཐོད་དབྱུག་གཡོན་སྡིགས་མཛུབ།།
In his right hand he holds a skull-mace and his left is in the threatening mudrā.
Hayagrīva, Sādhanas, Averting Obstacles, Longchen Nyingtik, Tibetan Masters, Jigme Lingpa