Manava Dharmashastra 2.141

2.141

vedasyaikadeśo mantraḥ brāhmaṇaṃ vā | vedavarjitāni vā kevalānyaṅgānyeva yo'dhyāpayatiḥ tathā sarvamapi vedam | vṛttyarthaṃ jīvikārtham, nācāyaṃkaraṇavidhivaśena, sa upādhyāyo nācāyryaḥ | anyenopanītaṃ yaḥ kṛtsnamapi vedamadhyāpayati nāsāvācāryaḥ | upanīyāpi yaḥ kṛtsnaṃ vedaṃ nādhyāpayati so'pi nācāyryaḥ | “yadyevamekadeśagrahaṇamupādhyāya lakṣaṇe kṛtamācāryalakṣaṇe upanayanagrahaṇam, yastarhya nupane tā kṛtsnavedādhyāpakaśca, tasya kiṃ lakṣaṇam | nāsāvācāryo nāpyupādhyāyaḥ | na cāpi nāmāntaraṃ tasya śrutam |” ucyate | ‘alpaṃ vā bahu vā yasya śrutasye’tyanena gururasāvācāryānnyūna upādhyāyādapyadhikaḥ | api punaḥ śabdau pādapūraṇārthau |

He is called “Upādhyāya,” “Sub-teacher,” who teaches, for a living, only a part of the Veda, or only the Vedic subsidiary sciences.—(141)

Medhātithi’s commentary (manubhāṣya):
‘A part of the Veda.’—The Mantra only or the Brāhmaṇa portion only;—Or, without the Veda itself, only the Vedic subsidiary sciences;—he who teaches this,—and also even the whole Veda, (but)—‘for a living,’—i.e., not prompted purely by the injunction of ‘becoming a preceptor,’—he is an Upādhyāya, a ‘Sub-teacher,’ not an Ācārya, ‘Preceptor.’

He who may teach even the entire Veda to a pupil initiated by another person, is not a ‘Preceptor’; nor is he a ‘Preceptor’ who, having initiated a pupil, does not teach him the entire Veda.

“If the teaching of a portion of the Veda is made the distinguishing feature of the ‘Sub-Teacher,’ and the Initiating is the characteristic of the ‘Preceptor,’—then what would be the character of that person who does not do the initiating, but teaches the whole Veda? He would be neither a ‘Preceptor’ (since he has not done the initiating), nor a ‘Sub-teacher’ (as he has not taught only a portion of the Veda). Nor has any other name been heard of for such a teacher.”

Our answer is as follows:—According to what is going to be said in 149 such a person would be the ‘Teacher,’ ‘Guru,’ Who is inferior to the ‘Preceptor,’ but superior to the ‘Subteacher.’

The terms ‘api’ ‘punaḥ’ in the Text only serve to fill in the metre.—(141)