SB 12.7.1

sūta uvāca
atharva-vit sumantuś ca
 śiṣyam adhyāpayat svakām
saṁhitāṁ so ’pi pathyāya
 vedadarśāya coktavān
Synonyms: 
sūtaḥ uvāca — Sūta Gosvāmī said; atharva-vit — the expert knower of the Atharva Veda; sumantuḥ — Sumantu; ca — and; śiṣyam — to his disciple; adhyāpayat — instructed; svakām — his own; saṁhitām — collection; saḥ — he, the disciple of Sumantu; api — also; pathyāya — to Pathya; vedadarśāya — to Vedadarśa; ca — and; uktavān — spoke.
Translation: 
Sūta Gosvāmī said: Sumantu Ṛṣi, the authority on the Atharva Veda, taught his saṁhitā to his disciple Kabandha, who in turn spoke it to Pathya and Vedadarśa.
Purport: 

As confirmed in the Viṣṇu Purāṇa:

atharva-vedaṁ sa muniḥ
 sumantur amita-dyutiḥ
śiṣyam adhyāpayām āsa
 kabandhaṁ so ’pi ca dvidhā
kṛtvā tu vedadarśāya
 tathā pathyāya dattavān

“That sage Sumantu, whose brilliance was immeasurable, taught the Atharva Veda to his disciple Kabandha. Kabandha in turn divided it into two parts and passed them down to Vedadarśa and Pathya.”