It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) went to Baqi’ al-Gharqad and, while sending the noble Companions on their mission, said: Set out taking the name of Allah. And he supplicated: O Allah, help them. (This was the group whom the Prophet [peace and blessings be upon him] sent towards Ka’b bin Ashraf.)
Hadith Referenceالفتح الربانی / أهم أحداث السنة الثانية للهجرة / 10725