[80] Then the Blessed One, having rebuked those bhikkhus in many ways, spoke in dispraise of being difficult to support, difficult to maintain, of having many wishes, of discontent, of socializing (saṅgaṇikā), and of laziness; and having spoken in many ways in praise of being easy to support, easy to maintain, of fewness of wishes, of contentment, of scrupulousness (dhuta), of effacement (sallekha), of what inspires confidence, of not accumulating, and of the arousing of energy, and having given the bhikkhus a Dhamma talk suitable and fitting to that matter, he addressed the bhikkhus:
"Bhikkhus, I allow a preceptor (upajjhāya). The preceptor, bhikkhus, will establish toward the pupil who shares his dwelling (saddhivihārika) the mind (citta) of a father toward a son; the pupil will establish toward the preceptor the mind of a son toward a father. Thus, dwelling with mutual respect, with deference, and living in harmony with one another, they will attain growth, increase, and abundance in this Dhamma and Vinaya.
"And thus, bhikkhus, should a preceptor be taken: having arranged the upper robe over one shoulder, having paid homage at his feet, having sat down squatting on the heels and raised the joined palms, he should be addressed thus: 'Venerable sir, be my preceptor; venerable sir, be my preceptor; venerable sir, be my preceptor.'
"If [the preceptor] makes it known by body, makes it known by speech, or makes it known by body and speech—[saying] 'Very well,' or 'Certainly,' or 'It is suitable,' or 'It is proper,' or 'Accomplish it in a manner that inspires confidence'—the preceptor has been taken. If he does not make it known by body, does not make it known by speech, does not make it known by body and speech, the preceptor has not been taken."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.