Jami` at-Tirmidhi Book 16, Hadith 36

that the Messenger of Allah (ﷺ) said: "If someone tries to get another's wealth without right, and he fights and is killed, then he is a martyr."

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that the Prophet (ﷺ) said: "Whoever is killed over his wealth, then he is martyr."

Jami` at-Tirmidhi Book 16, Hadith 35
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(Another chain of narration) from 'Abdullah bin 'Amr, from the Prophet (ﷺ) with similar meaning.

Jami` at-Tirmidhi Book 16, Hadith 37