Fighting in Jihad - Section 2 Mishkat al-Masabih 3949
Arabic hadith text
وَعَن سَمُرةَ بن جُندبٍ قَالَ: كَانَ شِعَارُ الْمُهَاجِرِينَ: عَبْدَ اللَّهِ وَشِعَارُ الْأَنْصَار: عبدُ الرَّحمنِ. رَوَاهُ أَبُو دَاوُد
Translation
Samura b. Jundub said that the war-cry of the Emigrants was ‘Abdallah and that of the Helpers ‘Abd ar-Rahman. Abu Dawud transmitted it.