Bhagavad Gita · 18.7

नियतस्य तु सन्न्यासः कर्मणो नोपपद्यते।मोहात्तस्य परित्यागस्तामसः परिकीर्तितः॥

niyatasya tu sannyāsaḥ karmaṇo nopapadyate mohāt tasya parityāgas tāmasaḥ parikīrtitaḥ

Renunciation of prescribed duties is not proper. Abandoning them out of delusion is declared to be in the mode of ignorance (tamas).

— Bhagavad Gita 18.7

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