Upaniṣads · Bṛhadāraṇyaka 5.7

Bṛhadāraṇyaka 5.7.1

विद्युद्ब्रह्मेत्याहुः ।
विदानाद्विद्युत् ।
विद्यत्येनं पाप्मनो य एवं वेद विद्युद्ब्रह्मेति ।
विद्युद्ध्येव ब्रह्म ॥ ५.७.१ ॥

They say that lightning is brahman. Lightning (vidyut) comes from knowing (vidāna). Whoever knows thus, that lightning is brahman, lightning frees him from evil. Lightning indeed is brahman.