avatārā hy asaṅkhyeyā
hareḥ sattva-nidher dvijāḥ
yathā 'vidāsinaḥ kulyāḥ
sarasaḥ syuḥ sahasraśaḥ
avatārāḥ - all the incarnations; hi - certainly; asaṅkhyeyāḥ - beyond counting; hareḥ - from the Supreme Personality of Godhead; sattva-nidheḥ - who is the reservoir of spiritual energy; dvijāḥ - O brāhmaṇas; yathā - as; avidāsinaḥ - containing a great reservoir of water; kulyāḥ - small rivulets; sarasaḥ - from a lake; syuḥ - must be; sahasraśaḥ - by hundreds and thousands of times.
This verse is quoted from Śrīmad-Bhāgavatam (1.3.26).