Dukkhasutta
Sāvatthinidānaṁ. Ekamantaṁ nisinno kho āyasmā rādho bhagavantaṁ etadavoca: “‘dukkhaṁ, dukkhan’ti, bhante, vuccati. Katamaṁ nu kho, bhante, dukkhan”ti? “Rūpaṁ kho, rādha, dukkhaṁ, vedanā dukkhā, saññā dukkhā, saṅkhārā dukkhā, viññāṇaṁ dukkhaṁ. Evaṁ passaṁ …pe… nāparaṁ itthattāyāti pajānātī”ti.
Suffering
At Sāvatthī. Seated to one side, Venerable Rādha said to the Buddha: “Sir, they speak of ‘suffering’. What is suffering?” “Rādha, form, feeling, perception, choices, and consciousness are suffering. Seeing this … They understand: ‘… there is nothing further for this place.’”