The Messenger of Allah ﷺ addressed us and said, "The best among you is the one who defends his kin, so long as he does not commit a sin in doing so."
حدثنا أحمد بن عمرو بن السرح حدثنا أيوب بن سويد عن أسامة بن زيد أنه سمع سعيد بن المسيب يحدث
خطبنا رسول الله ﷺ فقال خيركم المدافع عن عشيرته ما لم يأثم
No references are available.
[Its isnad is daif] Tabarani transmitted it in Al-Awsat: 7/ from Ayub bin Suwayd, and he is daif, and the chain is disconnected.