The Prophet (peace and blessings be upon him) said:
"Whoever defends the honour of his brother, it will be a screen of protection for him from the Fire."
Hadith Referenceصحیح الجامع الصغیر / حرف الميم / 6263
Hadith Gradingالألبانی:صحيح
Hadith Takhrij[هق] عن أبي الدرداء. غاية المرام ٤٣١.