The slogan

Isḥāq b. Ibrāhīm > Wakīʿ > Abū ʿUmays > Iyās b. Salamah b. al-Akwaʿ from his father

I confronted a man and killed him, then the Messenger of Allah ﷺ rewarded me by giving me what the man had taken. Our motto with Khalid bin Al-Walid was "kill."

حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ حَدَّثَنَا وَكِيعٌ عَنْ أَبِي عُمَيْسٍ عَنْ إِيَاسِ بْنِ سَلَمَةَ بْنِ الْأَكْوَعِ عَنْ أَبِيهِ قَالَ

بَارَزْتُ رَجُلًا فَقَتَلْتُهُ فَنَفَّلَنِي رَسُولُ اللَّهِ ﷺ سَلَبَهُ فَكَانَ شِعَارُنَا مَعَ خَالِدِ بْنِ الْوَلِيدِ أَمِتْ يَعْنِي اقْتُلْ