Niyata-puggala
Niyata-puggala: a 'person with a fixed destiny', may be either one who has committed one of the 5 'heinous actions with immediate result' ānantarika-kamma, or one who follows 'wrong views with fixed destiny' niyata-micchā-ditthi, or one who has reached one of the 4 stages of Nobility see: ariya-puggala About the latter cf. the frequent passage:;Those disciples in whom the 3 mental chains of personality-belief, sceptical doubt and attachment to mere rules and ritual; see: samyojana have vanished, they all have entered the stream, have forever escaped the states of woe; fixed is their destiny niyata assured their final enlightenment.
References
Maha Thera Nyanatiloka. Manual of Buddhist Terms and Doctrines, Buddhist Publication Society, first edition 1952.