Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 35
Sanskrit:
कर्मणा कर्मनिर्हार एष साधु निरूपित: ।यच्छ्रद्धया यजेद् विष्णुं सर्वयज्ञेश्वरं मखै: ॥ ३५ ॥
ITRANS:
karmaṇā karma-nirhāraeṣa sādhu-nirūpitaḥyac chraddhayā yajed viṣṇuṁsarva-yajñeśvaraṁ makhaiḥ
Translation:
[The sages said:] It has been definitely concluded that work is counteracted by further work when one executes Vedic sacrifices as a means of worshiping Viṣṇu, the Lord of all sacrifices, with sincere faith.