Srimad-Bhagavatam: Canto 11 - Chapter 1 - Verse 8
प्रवृत्तिलक्षणे निष्ठा पुमान् यर्हि गृहाश्रमे ।स्वधर्मे चानुतिष्ठेत गुणानां समितिर्हि सा ॥ ८ ॥
pravṛtti-lakṣaṇe niṣṭhāpumān yarhi gṛhāśramesva-dharme cānu tiṣṭhetaguṇānāṁ samitir hi sā
When a man desires sense gratification, being attached to family life, and when he consequently becomes established in religious and occupational duties, the combination of the modes of nature is manifest.
According to Śrīla Śrīdhara Svāmī, religious duties performed for promotion to heaven are understood to be in the mode of passion, those performed to enjoy ordinary family life are in the mode of ignorance, and those performed selflessly to fulfill one’s occupational duty in the varṇāśrama system are in the mode of goodness. The Lord has thus explained how mundane religiosity is manifest within the modes of nature.