Mahāparinibbāna Sutta 4.29.2

4.29.2

Atha kho etadeva dukkaratarañceva durabhisambhavatarañca yo saññī samāno jāgaro deve vassante deve gaḷagaḷāyante vijjullatāsu niccharantīsu asaniyā phalantiyā neva passeyya, na pana saddaṃ suṇeyyā”ti.

It’s far harder and more challenging to neither see nor hear a sound as the heavens are raining and pouring, lightning’s flashing, and thunder’s cracking!”