Manusmriti

siva.sh/manusmriti/9/125

सदृशस्त्रीषु जातानां पुत्राणामविशेषतः । न मातृतो ज्यैष्ठ्यमस्ति जन्मतो ज्यैष्ठ्यमुच्यते ॥ १२५ ॥

sanskrit

Between sons born of wives equal (in caste) (and) without (any other) distinction no seniority in right of the mother exists; seniority is declared (to be) according to birth.

english translation

sadRzastrISu jAtAnAM putrANAmavizeSataH | na mAtRto jyaiSThyamasti janmato jyaiSThyamucyate || 125 ||

hk transliteration by Sanscript