Bhagavad Gita · 4.37

यथैधांसि समिद्धोऽग्निर्भस्मसात्कुरुतेऽर्जुन।ज्ञानाग्निः सर्वकर्माणि भस्मसात्कुरुते तथा॥

yathaidhāṁsi samiddho 'gnir bhasmasāt kurute 'rjuna jñānāgniḥ sarva-karmāṇi bhasmasāt kurute tathā

As a blazing fire reduces firewood to ashes, O Arjuna, so does the fire of knowledge reduce all karma to ashes.

— Bhagavad Gita 4.37

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)