One verse

Srimad Bhagavatam 12.6.61

12.6.61

वैशम्पायनशिष्या वै चरकाध्वर्यवोऽभवन् । यच्चेरुर्ब्रह्महत्यांह: क्षपणं स्वगुरोर्व्रतम् ॥ ६१ ॥

vaiśampāyana-śiṣyā vai carakādhvaryavo ’bhavan yac cerur brahma-hatyāṁhaḥ kṣapaṇaṁ sva-guror vratam

vaiśampāyana-śiṣyāḥ
the disciples of Vaiśampāyana
vai
indeed
caraka
named the Carakas
adhvaryavaḥ
authorities of the Atharva Veda
abhavan
became
yat
because
ceruḥ
they executed
brahma-hatyā
due to the killing of a brāhmaṇa
aṁhaḥ
of the sin
kṣapaṇam
the expiation
sva-guroḥ
for their own guru
vratam
the vow

The disciples of Vaiśampāyana became authorities in the Atharva Veda. They were known as the Carakas because they executed strict vows to free their guru from his sin of killing a brāhmaṇa.