Mishkat al-Masabih 3950
Salama b. al-Akwa‘  said:
We went on an expedition with Abu Bakr in the time of the Prophet. We attacked the enemy by night and killed them, and our war-cry that night was “Put to death; put to death.” 

Abu Dawud transmitted it.
وَعَنْ سَلَمَةَ بْنِ الْأَكْوَعِ قَالَ: غَزَوْنَا مَعَ أبي بكر زمن النَّبِي صلى الله عَلَيْهِ وَسلم فبيَّتْناهُم نَقْتُلُهُمْ وَكَانَ شِعَارُنَا تِلْكَ اللَّيْلَةَ: أَمِتْ أَمِتْ. رَوَاهُ أَبُو دَاوُد