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