Srimad-Bhagavatam: Canto 3 - Chapter 1 - Verse 38
Sanskrit:
य: पृष्टो मुनिभि: प्राह धर्मान्नानाविदाञ्छुभान् ।नृणां वर्णाश्रमाणां च सर्वभूतहित: सदा ॥ ३८ ॥
ITRANS:
yaḥ pṛṣṭo munibhiḥ prāhadharmān nānā-vidhāñ chubhānnṛṇāṁ varṇāśramāṇāṁ casarva-bhūta-hitaḥ sadā
Translation:
In reply to questions asked by certain sages, he [Svāyambhuva Manu], out of compassion for all living entities, taught the diverse sacred duties of men in general and the different varṇas and āśramas.