Bhagavad Gita 18.48
सहजं कर्म कौन्तेय सदोषमपि न त्यजेत्। सर्वारम्भा हि दोषेण धूमेनाग्निरिवावृताः।।18.48।।
sahajaṃ karma kaunteya sadoṣamapi na tyajet| sarvārambhā hi doṣeṇa dhūmenāgnirivāvṛtāḥ||18.48||
sahajam karma kaunteya sadoshamapi na tyajet sarvarambha hi doshena dhumenagnirivavritah18.48
Meaning
One should not abandon one's natural duty, even if it has some defects. All undertakings are enveloped by defects, as fire is covered by smoke.
हे कौन्तेय! दोषयुक्त होने पर भी सहज कर्म को नहीं त्यागना चाहिए; क्योंकि सभी कर्म दोष से आवृत होते है, जैसे धुयें से अग्नि।
This is verse 48 of 78 in Chapter 18 (Moksha Sannyasa Yoga) of the Bhagavad Gita.