Bhagavad Gita · 2.40

नेहाभिक्रमनाशोऽस्ति प्रत्यवायो न विद्यते।स्वल्पमप्यस्य धर्मस्य त्रायते महतो भयात्॥

nehābhikrama-nāśho 'sti pratyavāyo na vidyate svalpam apy asya dharmasya trāyate mahato bhayāt

In this path, no effort is ever lost, and no harm is ever done. Even a little practice of this dharma protects one from great fear.

— Bhagavad Gita 2.40

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