Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 10
Sanskrit:
अन्योऽपि धर्मरक्षायै देह: संभ्रियते मया ।विरामायाप्यधर्मस्य काले प्रभवत: क्वचित् ॥ १० ॥
ITRANS:
anyo ’pi dharma-rakṣāyaidehaḥ saṁbhriyate mayāvirāmāyāpy adharmasyakāle prabhavataḥ kvacit
Translation:
I also assume other bodies to protect religion and to end irreligion whenever it flourishes in the course of time.