Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "Allah, the Exalted, says: 'I have no reward other than Jannah for a believing slave of Mine who remains patient for My sake when I take away his beloved one from among the inhabitants of the world".[Al- Bukhari].
Arabic/English book reference: Book 1, Hadith 32