Apastambadharmasutra 2.3.6.2

2.3.6.2

sādhutāṃ cet [pratijānīte- 'agnir upadraṣṭā vāyur upaśrotā-ādityo- 'anukhyātā sādhutāṃ#1 [pratijānīte sādhu-asmā [astu vitatha eṣa enasa ity [uktvā [śāstuṃ [pratipadyeta#2 / ( K 1:insets cet, 2:pratipadyate )

If he declares himself to be (of) good (family and conduct, the teacher elect) shall say, 'Agni who sees, Vâyu who hears, Âditya who brings to light, vouch for his goodness; may it be well with this person! He is free from sin.' Then he shall begin to teach him.