Shiva Purana

siva.sh/siva-purana/kotirudra-samhita/22/6

अदृष्टाभ्यां तदा ताभ्यां स्वभावान्मुनिसत्तमाः ।। तावदृष्ट्वा तदा तौ च स्वमातृपितरौ द्विजाः ।। ६।।

sanskrit

Then the foremost of the sages by their own nature were unseen by them The brāhmaṇas then saw their mother and father.

english translation

adRSTAbhyAM tadA tAbhyAM svabhAvAnmunisattamAH || tAvadRSTvA tadA tau ca svamAtRpitarau dvijAH || 6||

hk transliteration by Sanscript