Samādhisutta
Evaṁ me sutaṁ— …pe… sāvatthiyaṁ … tatra kho …pe… etadavoca: “samādhiṁ, bhikkhave, bhāvetha; samāhito, bhikkhave, bhikkhu yathābhūtaṁ pajānāti. Kiñca yathābhūtaṁ pajānāti? Rūpassa samudayañca atthaṅgamañca, vedanāya samudayañca atthaṅgamañca, saññāya samudayañca atthaṅgamañca, saṅkhārānaṁ samudayañca atthaṅgamañca, viññāṇassa samudayañca atthaṅgamañca.
Development of Immersion
So I have heard. At Sāvatthī. “Mendicants, develop immersion. A mendicant who has immersion truly understands. What do they truly understand? The origin and ending of form, feeling, perception, choices, and consciousness.