Assaparassasutta 4.2

4.2

Idha, bhikkhave, bhikkhu pañcannaṃ orambhāgiyānaṃ saṃyojanānaṃ parikkhayā opapātiko hoti tattha parinibbāyī anāvattidhammo tasmā lokā.

It’s when a mendicant, with the ending of the five lower fetters, is reborn spontaneously. They’re extinguished there, and are not liable to return from that world.