Pathamasikkhasutta 4.6

4.6

So pañcannaṃ orambhāgiyānaṃ saṃyojanānaṃ parikkhayā opapātiko hoti tattha parinibbāyī anāvattidhammo tasmā lokā.

With the ending of the five lower fetters they’re reborn spontaneously. They are extinguished there, and are not liable to return from that world.