Skandapurana 6.3.41.25

6.3.41.25

gāṃ prayacchati viprebhyastatphalaṃ śṛṇu pāṇḍava .
yāvanti tasyā romāṇi tatprasūtikuleṣu ca .. 41.25 ..

Hear the fruit of him who gives a cow to brahmins, O Pāṇḍava: / for as many hairs as are upon her and upon the line of her offspring,