Taittiriya Upanishad 1.11.4

1.11.4

ye tatra brāhmaṇāḥ saṃmarśinaḥ /
yuktā āyuktāḥ /
alūkṣā dharmakāmāḥ syuḥ /
yathā te tatra varteran /
tathā tatra vartethāḥ /
athābhyākhyāteṣu /
ye tatra brāhmaṇāḥ saṃmarśinaḥ /
yuktā āyuktāḥ /
alūkṣā dharmakāmāḥ syuḥ /
yathā te teṣu varteran /
tathā teṣu vartethāḥ /
eṣa ādeśaḥ /
eṣa upadeśaḥ /
eṣā vedopaniṣat /
etadanuśāsanam /
evamupāsitavyam /
evamu caitadupāsyam // 4//
ityekādaśa 'nuvākaḥ //

There should be no error in the duties towards the gods and manes. Let your mother be a goddess unto you. Let your father be a god unto you. Let your teacher be a god unto you. Let your guest be a god unto you. The works that are not blameworthy are to be resorted to, but not the others. These actions of ours that are commendable are to be followed by you, but not the others. You should, by offering seats, remove the fatigue of those Brāhmaṇas who are more praiseworthy among us. The offering should be with honour; the offering should not be with dishonour. The offering should be in plenty. The offering should be with modesty. The offering should be with awe. The offering should be with sympathy. Then, should you have any doubt with regard to duties or customs, you should behave in those matters just as the Brāhmaṇas do, who may happen to be there and who are able deliberators, who are adepts in those duties and customs, who are not directed by others, who are not cruel, and who are desirous of merit. Then, as for the accused people, you should behave with regard to them just as the Brāhmaṇas do, who may happen to be there and who are able deliberators, who are adepts in those duties and customs, who are not directed by others, who are not cruel, who are desirous of merit. This is the injunction. This is the instruction. This is the secret of the Vedas. This is divine behest. This is how the meditation is to be done. This is how this must be meditated on.