1. Allah’s Messenger said:“Allah will not show mercy to him who does not show mercy to others.” [Al-Bukhari and Muslim]
2. Allah’s Messenger said:
“A Muslim is a brother of another Muslim. So he should not oppress him neither should he hand him over to [his Satan or to his self which is inclined to evil]. Whoever fulfils the needs of his brother, Allah will fulfil his needs; whoever removes the troubles of his brother, Allah will remove one of his troubles on the Day of Resurrection; And whoever covers up the fault of a Muslim, Allah will cover up his fault on the Day of Resurrection.” [Al-Bukhari and Muslim]
3. Allah’s Messenger said:
“A Muslim is brother to a Muslim. He should neither deceive him nor accuse him of lying, 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]. Despising one’s Muslim brother is enough evil for a person.” [At-Tirmidzi]
