Shiva Purana
त्रिपुण्ड्रं कुरुते यस्तु भस्मना विधिपूर्वकम् । महापातकसंघातैर्मुच्यते चोपपातकैः ५२ ।
He who makes Tripuṇḍra duly with the ash is freed from groups of great as well as small sins.
english translation
tripuNDraM kurute yastu bhasmanA vidhipUrvakam । mahApAtakasaMghAtairmucyate copapAtakaiH 52 ।
hk transliteration by Sanscript