Paccavekkhaṇasutta

Evaṁ me sutaṁ— ekaṁ samayaṁ bhagavā sāvatthiyaṁ viharati jetavane anāthapiṇḍikassa ārāme. Tena kho pana samayena bhagavā attano aneke pāpake akusale dhamme pahīne paccavekkhamāno nisinno hoti, aneke ca kusale dhamme bhāvanāpāripūriṁ gate.

So I have heard. At one time the Buddha was staying near Sāvatthī in Jeta’s Grove, Anāthapiṇḍika’s monastery. Now at that time the Buddha was sitting reviewing his own giving up of many bad, unskillful qualities, and the many skillful qualities he had fully developed.

Atha kho bhagavā attano aneke pāpake akusale dhamme pahīne viditvā aneke ca kusale dhamme bhāvanāpāripūriṁ gate tāyaṁ velāyaṁ imaṁ udānaṁ udānesi:

Then, knowing the many bad, unskillful qualities that he had given up and the many skillful qualities he had fully developed, on that occasion the Buddha expressed this heartfelt sentiment:

“Ahu pubbe tadā nāhu, nāhu pubbe tadā ahu; Na cāhu na ca bhavissati, na cetarahi vijjatī”ti. Tatiyaṁ.

“What was before then was not; what before was not then was. It never was, nor will it be, nor is it found today.”