Jami` at-Tirmidhi Book 16, Hadith 37
(Another chain of narration) from 'Abdullah bin 'Amr, from the Prophet (ﷺ) with similar meaning.
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."
that he heard the Messenger of Allah (ﷺ) saying: "Whoever is killed over his wealth then he is a martyr, and whoever is killed over his religion, then he is a martyr, and whoever is killed over his blood, then he is martyr, and whoever is killed over his family, then he is martyr."