Mahāparinibbāna Sutta 4.33.3

4.33.3

Yatra hi nāma saññī samāno jāgaro deve vassante deve gaḷagaḷāyante vijjullatāsu niccharantīsu asaniyā phalantiyā neva dakkhati, na pana saddaṃ sossatī’ti.

in that, while conscious and awake he neither saw nor heard a sound as the heavens were raining and pouring, lightning was flashing, and thunder was cracking.’