Garudapurana 2.47.30

2.47.30

yamadvāre mahāghore śrutvā vaitaraṇīṃ tadīm /
tartukāmo dadāmyenāṃ tubhyaṃ vaitaraṇīṃ namaḥ //

“Having heard of that Vaitaraṇī river at the terrifying gate of Yama, / wishing to cross it, I give this Vaitaraṇī [cow] to you; salutations!”