Srimad-Bhagavatam: Canto 10 - Chapter 1 - Verse 39
Sanskrit:
न चास्य कर्म वा लोके सदसन्मिश्रयोनिषु ।क्रीडार्थं सोऽपि साधूनां परित्राणाय कल्पते ॥ ३९ ॥
ITRANS:
na cāsya karma vā lokesad-asan-miśra-yoniṣukrīḍārthaṁ so ’pi sādhūnāṁparitrāṇāya kalpate
Translation:
He has no work to do in this world that would oblige Him to take birth in pure, impure or mixed species of life. Yet to enjoy His pastimes and deliver His saintly devotees, He manifests Himself.