Tatiyasutasutta

sn29.9:1.1 At Sāvatthī.

sn29.9:1.2 Seated to one side, that mendicant said to the Buddha:

sn29.9:1.3 “Sir, what is the cause, what is the reason why someone, when their body breaks up, after death, is reborn in the company of the moisture-born dragons?”

sn29.9:1.4 (Tell all in full.)