Matsya Purana 196.45

196.45

ṛṣirmitravaraścaiva ṛṣivān mānavastathā.
parasparamavaivāhyā ṛṣayaḥ parikīrtitāḥ .. 196.46

They should not also intermarry among themselves Titira, Kapibhû, Gârgya are the three Pravaras so are Aṁgirâ, Titira, Kapibhu They should not intermarry among themselves Rikṣa, Bharadvaja, Rıṣıvân, Mânava, Maittravara Rıṣı are also known as the Ârṣeya Pravaras and Aṁgirı, Bharadvaja Vrihaspatı Mittravara Rıṣı Rıṣıvâna, and Mânava also cannot intermarry among themselves—42 46