At Savatthi. “Bhikkhus, form is suffering, feeling is suffering, perception is suffering, volitional formations are suffering, consciousness is suffering. Seeing thus … He understands: ‘… there is no more for this state of being.’”
SN22.13: Dukkhasutta
Dukkhasutta: Suffering - translated by Bhikkhu Bodhi
Translated by Bhikkhu Bodhi. Source text via SuttaCentral.