Atharvaveda 7.2.1

7.2.1

átharvāṇaṃ pitáraṃ devábandhuṃ mātúr gárbhaṃ pitúr ásuṃ yúvānam |
yá imáṃ yajñám mánasā cikéta prá ṇo vocas tám ihéhá bravaḥ ||1||

Father Atharvan, god-relative, mother's fœtus, father's spirit (ásu), young, who understands (cit) with the mind this sacrifice—him mayest thou proclaim to us here, here mayest thou speak.