Skandapurana 5.127.26

5.127.26

yayāyayā dvijo yaśca kṣatriṇyā'bhūdvṛtaḥ purā ..
tayā saha samāgatya snātaṃ mantrapuraskṛtam .. 26 ..

Whichever brahmin was formerly chosen by whichever kṣatriya woman, / having come together with her, bathed with recitation of mantras;