There are teachings grouped by three that have been rightly explained by the Buddha. You should all recite these in concert. What are the teachings grouped by three?

Three unskillful roots: greed, hate, and delusion.

Three skillful roots: non-greed, non-hate, and non-delusion.

Three ways of performing bad conduct: by body, speech, and mind.

Three ways of performing good conduct: by body, speech, and mind.

Three unskillful thoughts: sensuality, malice, and cruelty.

Three skillful thoughts: renunciation, good will, and harmlessness.

Three unskillful intentions: sensuality, malice, and cruelty.

Three skillful intentions: renunciation, good will, and harmlessness.

Three unskillful perceptions: sensuality, malice, and cruelty.

Three skillful perceptions: renunciation, good will, and harmlessness.

Three unskillful elements: sensuality, malice, and cruelty.

Three skillful elements: renunciation, good will, and harmlessness.

Another three elements: sensuality, form, and formlessness.

Another three elements: form, formlessness, and cessation.

Another three elements: lower, middle, and higher.

Three cravings: for sensual pleasures, to continue existence, and to end existence.

Another three cravings: sensuality, form, and formlessness.

Another three cravings: form, formlessness, and cessation.

Three fetters: identity view, doubt, and misapprehension of precepts and observances.

Three defilements: sensuality, desire for continued existence, and ignorance.

Three realms of existence: sensual, form, and formless.

Three searches: for sensual pleasures, for continued existence, and for a spiritual path.

Three kinds of discrimination: ‘I’m better’, ‘I’m equal’, and ‘I’m worse’.

Three periods: past, future, and present.

Three extremes: identity, the origin of identity, and the cessation of identity.

Three feelings: pleasure, pain, and neutral.

Three forms of suffering: the suffering inherent in painful feeling, the suffering inherent in conditions, and the suffering inherent in perishing.

Three heaps: inevitability regarding the wrong way, inevitability regarding the right way, and lack of inevitability.

Three darknesses: one is doubtful, uncertain, undecided, and lacking confidence about the past, future, and present.

Three things a Realized One need not hide. The Realized One’s behavior by way of body, speech, and mind is pure. He has no misconduct in these three ways that need be hidden, thinking: ‘May others not know this of me.’

Three possessions: greed, hate, and delusion.

Three fires: greed, hate, and delusion.

Another three fires: a fire for those worthy of offerings dedicated to the gods, a fire for householders, and a fire for those worthy of a religious donation.

A threefold classification of the physical: visible and resistant, invisible and resistant, and invisible and non-resistant.

Three choices: good choices, bad choices, and imperturbable choices.

Three individuals: a trainee, an adept, and one who is neither a trainee nor an adept.

Three seniors: a senior by birth, a senior in the teaching, and a senior by convention.

Three grounds for making merit: giving, ethical conduct, and meditation.

Three grounds for accusations: what is seen, heard, and suspected.

Three kinds of sensual rebirth. There are sentient beings who desire what is present. They fall under the sway of presently arisen sensual pleasures. Namely, humans, some gods, and some beings in the underworld. This is the first kind of sensual rebirth. There are sentient beings who desire to create. Having repeatedly created, they fall under the sway of sensual pleasures. Namely, the Gods Who Love to Create. This is the second kind of sensual rebirth. There are sentient beings who desire what is created by others. They fall under the sway of sensual pleasures created by others. Namely, the Gods Who Control the Creations of Others. This is the third kind of sensual rebirth.

Three kinds of pleasant rebirth. There are sentient beings who, having repeatedly given rise to it, dwell in pleasure. Namely, the gods of Brahmā’s Host. This is the first pleasant rebirth. There are sentient beings who are drenched, steeped, filled, and soaked with pleasure. Every so often they feel inspired to exclaim: ‘Oh, what bliss! Oh, what bliss!’ Namely, the gods of streaming radiance. This is the second pleasant rebirth. There are sentient beings who are drenched, steeped, filled, and soaked with pleasure. Since they’re truly content, they experience pleasure. Namely, the gods replete with glory. This is the third pleasant rebirth.

Three kinds of wisdom: the wisdom of a trainee, the wisdom of an adept, and the wisdom of one who is neither a trainee nor an adept.

Another three kinds of wisdom: wisdom produced by thought, learning, and meditation.

Three weapons: learning, seclusion, and wisdom.

Three faculties: the faculty of understanding that one’s enlightenment is imminent, the faculty of enlightenment, and the faculty of one who is enlightened.

Three eyes: the eye of the flesh, the eye of clairvoyance, and the eye of wisdom.

Three trainings: in higher ethics, higher mind, and higher wisdom.

Three kinds of development: the development of physical endurance, the development of the mind, and the development of wisdom.

Three unsurpassable things: unsurpassable seeing, practice, and freedom.

Three kinds of immersion. Immersion with placing the mind and keeping it connected. Immersion without placing the mind, but just keeping it connected. Immersion without placing the mind or keeping it connected.

Another three kinds of immersion: emptiness, signless, and undirected.

Three purities: purity of body, speech, and mind.

Three kinds of sagacity: sagacity of body, speech, and mind.

Three skills: skill in progress, skill in regress, and skill in means.

Three vanities: the vanity of health, the vanity of youth, and the vanity of life.

Three ways of putting something in charge: putting oneself, the world, or the teaching in charge.

Three topics of discussion. You might discuss the past: ‘That is how it was in the past.’ You might discuss the future: ‘That is how it will be in the future.’ Or you might discuss the present: ‘This is how it is at present.’

Three knowledges: recollection of past lives, knowledge of the death and rebirth of sentient beings, and knowledge of the ending of defilements.

Three meditative abidings: the meditation of the gods, the meditation of Brahmā, and the meditation of the noble ones.

Three demonstrations: a demonstration of psychic power, a demonstration of revealing, and an instructional demonstration.

These are the teachings grouped by three that have been rightly explained by the Buddha. You should all recite these in concert.