Skandapurana 6.3.182.54

6.3.182.54

suvarṇaśṛṅgīṃ kapilāṃ payasvinīṃ sādhvīṃ suśīlāṃ taruṇīṃ savatsām .
dattvā dvije sarvavratopapanne phalaṃ ca yatsyāttadihaiva nūnam .. 182.54 ..

The fruit one gains by giving a tawny cow with golden horns, rich in milk, gentle, of good temper, young, and accompanied by her calf, / to a brahmin endowed with all vows—surely that is gained right here.