Embrace Islam, and ye Shall be safe. [Tabari Volume 9] The remaining inhabitants agreed to convert, and Muhammad sent a despatch (official report), making it known that he was happy with the result. It is mentioned by Tabari that Khalid ibn al-Walid, stayed with them to teach them Islam, then returned with a deputation of the tribe to Muhammad. Muhammad criticised the tribe for previously defending themselves against him when his followers attacked them, he said "You are the ones when driven away would push forward.", and then said that if they did not surrender when Khalid was sent to them, he would have cut their heads off, he said: "Had Khalid b. al-Walid not written to me that you had surrendered and had not fought, I would have thrown your heads underneath your feet."[Tabari Volume 9] Muhammad then engaged in an argument with them about how they defeated previous tribes which attacked them. The event is partly mentioned in the Quran verse 3:61  The event is also mentioned by the Muslim Jurist Tabari, as follows: Tabari said Abdullah ibn Abi Bakr was the narrator of the event. The information of the letters mentioned by Tabari in the above has also been collected by Muhammad Hamidullah (and he considers his letters authentic ). Muhammad Hamidullah collected 6 of Muhammad's letters whose original texts have been preserved, he compiled it in his French book "Six Originaux des letters diplomatiques du Prophete e l'Islam". The translator of Tabari, The last Years of the Prophet, Isma'il Qurban Husayn, mentions in the footnote on page 83, that the letter mentioned by Tabari is also in the texts collected by Muhammad Hamidullah.