āsan varṇās trayo hy asya
gṛhṇato 'nu-yugaṁ tanūḥ
śuklo raktas tathā pīta
idānīṁ kṛṣṇatāṁ gataḥ
āsan - were; varṇāḥ - colors; trayaḥ - three; hi - certainly; asya - of this one; gṛhṇataḥ - who is manifesting; anu-yugam - according to the age; tanūḥ - bodies; śuklaḥ - white; raktaḥ - red; tathā - thus; pītaḥ - yellow; idānīm - now; kṛṣṇatām - blackness; gataḥ - obtained.
This is a verse from Śrīmad-Bhāgavatam (10.8.13).