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Verse 1 in Pāḷi: Yamaka

Manopubbaṅgamā dhammā,
manoseṭṭhā manomayā,
manasā ce paduṭṭhena
bhāsati vā karoti vā,
tato naṁ dukkham anveti
cakkaṁ va vahato padaṁ.

The background story can be found here:
https://what-buddha-said.net/Canon/Sutta/KN/Dhammapada.Verse_1.story.htm

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