Adbhutasagara 48.85

48.85

ādityapurāṇe|
divodakenaiva mukhaṃ prapūrya phūtkṛtya tanmadhyagataṃ na paśyet|
surendracāpaṃ tvatha vīkṣitaṃ cenmāsaiścaturbhiḥ kila saṃprayāti||

In the Ādityapurāṇa:
"Having filled the mouth with water by day and blown it out, if one does not see a rainbow inside it,
though it was seen before, he departs indeed in four months."