SB 1.4.22

atharvāṅgirasām āsīt
 sumantur dāruṇo muniḥ
itihāsa-purāṇānāṁ
 pitā me romaharṣaṇaḥ
Word for word: 
atharva — the Atharva Veda; aṅgirasām — unto the ṛṣi Aṅgirā; āsīt — was entrusted; sumantuḥ — also known as Sumantu Muni; dāruṇaḥ — seriously devoted to the Atharva Veda; muniḥ — the sage; itihāsa-purāṇānām — of the historical records and the Purāṇas; pitā — father; me — mine; romaharṣaṇaḥ — the ṛṣi Romaharṣaṇa.
Translation: 
The Sumantu Muni Aṅgirā, who was very devotedly engaged, was entrusted with the Atharva Veda. And my father, Romaharṣaṇa, was entrusted with the Purāṇas and historical records.
Purport: 

In the śruti-mantras also it is stated that Aṅgirā Muni, who strictly followed the rigid principles of the Atharva Veda, was the leader of the followers of the Atharva Veda.