गृह्योक्तकर्मणा येन समीपं नीयते गुरोः ।
बालो वेदाय तद्योगाद्बालस्योपनयं विदुः ॥
gṛhyokta-karmaṇā yena samīpaṁ nīyate guroḥ |
bālo vedāya tad yogād bālasyopanayaṁ viduḥ ||
(Aparārka, the earliest commentator on Yājñavalkya-smṛti commentator)
“Know that by which a boy is brought near the guru by means of a rite stated in the Gṛhyas [i.e., the Gṛhya-sūtras] for the purpose of [studying] the Veda [alt., for the sake of acquiring knowledge] on account of occasion [i.e., because the boy has reached the age at which this is to be done] to be the boy’s upanayana [lit., ‘bringing (nayana) near (upa)’].”