Sayyiduna Abu Musa (may Allah be pleased with him) says that whenever someone in need came to the Prophet (peace and blessings be upon him), he (peace and blessings be upon him) would say: "Intercede, and you will be rewarded; and Allah decrees on the tongue of His Prophet whatever He wills."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16679
Sayyiduna Ibn Umar (may Allah be pleased with them both) says that the Prophet (peace and blessings be upon him) said: "Whoever helps his Muslim brother before a ruler, or eases a hardship, will be helped across the Sirat on the Day of Resurrection, when feet will slip."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16680
Abu Hurayrah (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) said: "The believer is a mirror and a brother to the believer; when he meets him he protects him from his faults, and he guards him behind his back."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16681
Sayyiduna Jabir bin Abdullah and Sayyiduna Abu Talhah bin Sahl al-Ansari (may Allah be pleased with them both) say that the Prophet (peace and blessings be upon him) said: "Whoever disgraces a Muslim in a place where his honour and sanctity are diminished, Allah will also disgrace him in a place where he will need His help; and whoever helps his Muslim brother in a place where his honour is at stake, Allah will also help him in a place where he will need help."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16682
Sayyiduna Abu al-Darda' (may Allah be pleased with him) says that a man spoke ill of another man in the presence of the Prophet (peace and blessings be upon him), and a man defended him. So he (peace and blessings be upon him) said: "Whoever defends the honour of his Muslim brother, it will be a screen for him from Hell." [Da'if (weak)]
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16684
Sayyiduna Anas (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) said: "Whoever helps his brother in his absence, Allah will help him in this world and the Hereafter."
It has also been narrated from al-Hasan, from Imran bin Husayn as mawquf (his own statement), and also as marfu'; the mawquf is more correct, and Allah knows best.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16685