Saṁyutta Nikāya 15.14 2. Dutiyavagga Mātusutta

Sāvatthiyaṁ viharati.

At Sāvatthī.

“Anamataggoyaṁ, bhikkhave, saṁsāro …pe…

“Mendicants, this transmigration has no known beginning. …

na so, bhikkhave, satto sulabharūpo yo namātābhūtapubbo iminā dīghena addhunā.

It’s not easy to find a sentient being who in all this long time has not previously been your mother.

Taṁ kissa hetu?

Why is that?

Anamataggoyaṁ, bhikkhave, saṁsāro …pe…

This transmigration has no known beginning. …

alaṁ vimuccitun”ti.

This is quite enough for you to become disillusioned, dispassionate, and freed regarding all conditions.”

Catutthaṁ.