SB 3.12.20

maitreya uvāca
evam ātmabhuvādiṣṭaḥ
 parikramya girāṁ patim
bāḍham ity amum āmantrya
 viveśa tapase vanam
Word for word: 
maitreyaḥ uvāca — Śrī Maitreya said; evam — thus; ātma-bhuvā — by Brahmā; ādiṣṭaḥ — being so requested; parikramya — by circumambulating; girām — of the Vedas; patim — unto the master; bāḍham — that is right; iti — thus; amum — unto Brahmā; āmantrya — thus addressing; viveśa — entered into; tapase — for the matter of penance; vanam — into the forest.
Translation: 
Śrī Maitreya said: Thus Rudra, having been ordered by Brahmā, circumambulated his father, the master of the Vedas. Addressing him with words of assent, he entered the forest to perform austere penances.