Take another mendicant who says: ‘In such-and-such monastery there is a single senior mendicant who is very learned, an inheritor of the heritage, who has memorized the teachings, the monastic law, and the outlines. I’ve heard and learned this in the presence of that senior mendicant: this is the teaching, this is the training, this is the Teacher’s instruction.’ You should neither approve nor reject that mendicant’s statement. Instead, having carefully memorized those words and phrases, you should make sure they fit in the discourse and are exhibited in the training. If they fit in the discourse and are exhibited in the training, you should draw the conclusion: ‘Clearly this is the word of the Blessed One, the perfected one, the fully awakened Buddha. It has been correctly memorized by that senior mendicant.’ You should remember it. This is the fourth great reference. These are the four great references.”
Numbered Discourses 4.181 19. Brahmins A Warrior
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Mendicants, a warrior with four factors is worthy of a king, fit to serve a king, and is reckoned a factor of kingship. What four? He’s skilled in the basics, a long-distance shooter, a marksman, one who shatters large objects. A warrior with these four factors is worthy of a king, fit to serve a king, and is reckoned a factor of kingship. In the same way, a mendicant with four qualities is worthy of offerings dedicated to the gods, worthy of hospitality, worthy of a religious donation, worthy of veneration with cupped palms, and is the supreme field of merit for the world. What four? He’s skilled in the basics, a long-distance shooter, a marksman, one who shatters large objects.
And how is a mendicant skilled in the basics? It’s when a mendicant is ethical, restrained in the monastic code, conducting themselves well and resorting for alms in suitable places. Seeing danger in the slightest fault, they keep the rules they’ve undertaken. That’s how a mendicant is skilled in the basics.