Bhagavatapurana 4.15.9

4.15.9

brahmā jagad-gurur devaiḥ sahāsṛtya sureśvaraiḥ /
vainyasya dakṣiṇe haste dṛṣṭvā cihnaṃ gadābhṛtaḥ //

9—10. Brahma the father of all the world came with all the great gods and observed on the right arm of Vena's son the mark of Gadabrith (the mark of Vishnu) and the lotus-mark on the feet and thereupon knew him to be an Amsa of Hari; for he is an Amsa of the Supreme Lord who bears the Chakra mark not crossed or touched by other lines.