Sunīti informed her son: Your grandfather Svāyambhuva Manu executed great sacrifices with distribution of charity, and thereby, with unflinching faith and devotion, he worshiped and satisfied the Supreme Personality of Godhead. By acting in that way, he achieved the greatest success in material happiness and afterwards achieved liberation, which is impossible to obtain by worshiping the demigods.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
तथा मनुर्वो भगवान् पितामहो यमेकमत्या पुरुदक्षिणैर्मखैः । इष्ट्वाभिपेदे दुरवापमन्यतो भौमं सुखं दिव्यमथापवर्ग्यम्
tathā manurvo bhagavān pitāmaho yamekamatyā purudakṣiṇairmakhaiḥ | iṣṭvābhipede duravāpamanyato bhaumaṃ sukhaṃ divyamathāpavargyam
SB 4.8.21