The Law Code of Yājñavalkya 1.3.11

1.3.11

arogiṇīm acikitsanīyavyādhyanupasṛṣṭām | bhātṛmatīṃ putrikākaraṇaśaṅkānivṛttaye | anenāparibhāṣitāpi putrikā bhavatīti gamyate | asamānārṣagotrajām ṛṣer idam ārṣaṃ nāma pravara ity arthaḥ | gotraṃ vaṃśaparamparāprasiddham | ārṣaṃ ca gotraṃ ca ārṣagotre | samāne ārṣagotre yasyāsau samānārṣagotras tasmāj jātā samānārṣagotrajā na samānārṣagotrajā asamānārṣagotrajā tām | gotrapravarau ca pṛthak pṛthak paryudāsanimittam | tenāsamānārṣajām asamānagotrajām iti | tathā ca asamānapravarair vivāhaḥ (GDh 4.2) iti gautamaḥ | tathā |

‘Free from disease’ means not afflicted with an incurable disease. ‘Having a brother’ is in order to remove the suspicion of her being made an appointed daughter (putrikā); from this it is understood that even an unstated daughter may become an appointed daughter. ‘Not born of the same ṛṣi or gotra’: belonging to a ṛṣi (ārṣa) means the invocation of ancestral sages (pravara); gotra is well known in hereditary lineage. The ārṣa and the gotra are ārṣagotra. One who has the same ārṣa and gotra is of the same ārṣagotra; born from such a one is born of the same ārṣagotra; one who is not born of the same ārṣagotra is asamānārṣagotrajā; [he should marry] her. Gotra and pravara are each separate grounds for exclusion. Therefore, [it means] not born of the same ārṣa and not born of the same gotra. And accordingly Gautama states: 'Marriage is with those who do not share the same pravara.' So too: