Riyad as-Salihin: The Book of Miscellany – Hadith No. 1451 — Abu Hurairah (May Allah bepleased with him) reported: Messenger of Allah (ﷺ)… (Hadith No. 1451)

Abu Hurairah (May Allah bepleased with him) reported: Messenger of Allah (ﷺ) said, "A Muslim is a brother to a Muslim. He should neither deceive him nor lie to him, nor leave him without assistance. Everything belonging to a Muslim is inviolable for a Muslim; his honour, his blood and property. Piety is here (and he pointed out to his chest thrice). It is enough for a Muslim to commit evil by despising his Muslim brother.".

Explanation:

Reference: Riyad as-Salihin, The Book of Miscellany, Hadith No. 1451