Garudapurana 2.6.72

2.6.72

nimajjya yatra kākolā rājahaṃsatvamāyayuḥ /
asuro yatra devatvamavāpa snānamātrataḥ //

plunging into which crows attained the state of royal swans, / and where an asura attained the state of a god merely by bathing;