Bhagavad Gita 3.20 Chapter 3, Verse 20

कर्मणैव हि संसिद्धिमास्थिता जनकादयः ।
लोकसंग्रहमेवापि संपश्यन्कर्तुमर्हसि ॥३.२०॥

karmaṇaiva hi saṃsiddhimāsthitā janakādayaḥ
lokasaṃgrahamevāpi saṃpaśyankartumarhasi

Meaning

King Janaka and others attained perfection through action alone. You too should act, keeping in view the welfare and right guidance of the world.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 3.20 (Chapter 3, The Yoga of Action (Karma Yoga), Verse 20)