Puttasutta

Sāvatthiyaṁ viharati …pe… “na so, bhikkhave, satto sulabharūpo yo naputtabhūtapubbo …pe… alaṁ vimuccitun”ti. Aṭṭhamaṁ.

At Sāvatthī. “It’s not easy to find a sentient being who in all this long time has not previously been your son. … This is quite enough for you to become disillusioned, dispassionate, and freed regarding all conditions.”