俱舍論記 9.35

9.35

「毘婆沙說至餘處餘類」者，第四師正義。若定此處此類父母應生業力，即令此父母緣和合，雖住遠方令其即至，雖極持戒亦起染心。若非定託此父母和合緣，如其所應，便即寄生餘處、餘類。如人中有寄鶴卵生，雖寄彼生還是人攝。餘寄受生，準此應釋。

[On the passage] 'The Vibhāṣā says... in another place and another species': this is the correct view of the fourth master. If karmic force definitely dictates that birth should occur from these parents in this place and of this species, it causes the conditions of these parents to converge; even if they dwell in a distant land, it causes them to arrive immediately; even if they strictly uphold the precepts, they will give rise to a defiled mind. If it is not definitely reliant on the converging conditions of these parents, then as appropriate, it immediately takes up birth by substitution in another place or another species. For instance, the intermediate existence of a human may take up birth by substitution in a crane's egg; although born by substitution in that [egg], it is still subsumed under the human [realm]. Other births taken by substitution should be explained according to this.