Complete verse is as follows.
Janmanā jāyatē jantuḥ karmaṇā jāyatē dvijaḥ |
vēdādhyayanatō vipraḥ brahmavid brāhmaṇa smr̥taḥ ||
In Devanagari script:
जन्मना जायते जन्तु: कर्मणा जायते द्विज:। वेदाध्ययनतो विप्र: ब्रह्नविदं ब्राह्मण: स्मृत:।।
जन्मना जायते जन्तुः कर्मणा जायते द्विजः । वेदाध्ययनतो विप्रो ब्रह्मविद् ब्राह्मणः स्मृतः ॥
Translation/Meaning: By birth we are animals. From samskaara such as upanayana, one becomes a dwija. By studying Vedas, one becomes a vipra. Only with brahma vidya one becomes a Brahmin.
This sloka is usually shared with vaṭu during upanayana. I would love to know if anyone could share more details about it. Thank you!
Edit: The question is similar to the one asked here. However, the sloka cited here is different from that of the question.