A Muslim is the brother and/or sister of another Muslim ... (hadith)

Narrated `Abdullah bin `Umar:

Allah’s Apostle said, “A Muslim is a brother of another Muslim, so he should not oppress him, nor should he hand him over to an oppressor. Whoever fulfilled the needs of his brother, Allah will fulfill his needs; whoever brought his (Muslim) brother out of a discomfort, Allah will bring him out of the discomforts of the Day of Resurrection, and whoever screened a Muslim, Allah will screen him on the Day of Resurrection . “

Sahih Bukhari, Book # 46

The most beloved of people to God (Hadith)

The Prophet Muhammad ﷺ (peace be upon him) said: "The most beloved of people according to Allah is he who brings most benefit, and the most beloved of deeds according to Allah the Mighty, the Magnificent, is that you bring happiness to a fellow Muslim, or relieve him of distress, or pay off his debt or stave away hunger from him. It is more beloved to me that I walk with my brother Muslim in his time of need than I stay secluded in the mosque for a month. Whoever holds back his anger, Allah will cover his faults and whoever suppresses his fury while being able to execute it, Allah will fill his heart with satisfaction on the Day of Standing. Whoever walks with his brother Muslim in need until he establishes that for him, Allah will establish his feet firmly on the day when all feet shall slip. Indeed, bad character ruins deeds just as vinegar ruins honey." [Tabarâni, Hasan]