Imam Al-Nawawi’s Riyad-us-Saliheen
Warning against persecution of the Pious, the Weak and the Indigent
Allah, the Exalted, says:
“And those who annoy believing men and women undeservedly, they bear (on themselves) the crime of slander and plain sin.” (33:58)
“Therefore, treat not the orphan with oppression. And repulse not the beggar.” (93:9,10)
389. Jundub bin Abdullah (May Allah be pleased with him) reported: Messenger of Allah (sallallaahu alayhi wa sallam) said, “He who performs the Fajr (dawn) prayer comes under the Protection of Allah, so beware lest Allah questions you about what you owe Him. For if He questions anyone of you and he falls short of fulfilling the duty which he owes Him, He will requite and then throw upon his face into the Hell-fire”.