Skandapurana 5.211.4

5.211.4

lakṣyate kenacitpāro gādheḥ putrasya dhīmataḥ ..
kṣatriyo'pi dvijatvaṃ yaḥ saṃprāpto dvijasattamāḥ.. .. 4

the limit cannot be discerned by anyone, of that wise son of Gādhi, / who, though a kṣatriya, attained the status of a brahmin, O best of the twice-born;