Bhaginisutta

Suttapiṭaka · Saṁyuttanikāya · Nidānavaggasaṁyutta · Vol. 16 · Section 453

[453] Dwelling at Sāvatthī. … There the Blessed One … "Bhikkhus, this saṃsāra is without discoverable beginning. … It is not easy, bhikkhus, to find a being who has not previously been your sister. …" The seventh.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 4 other places