Sunan Abi Dawud Book 2, Hadith 396
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Yazid al-Farisi said: I heard Ibn Abbas say: I asked Uthman ibn Affan: What moved you to put the (Surah) al-Bara'ah which belongs to the mi'in (surahs) (containing one hundred verses) and the (Surah) al-Anfal which belongs to the mathani (Surahs) in the category of as-sab'u at-tiwal (the first long surah or chapters of the Qur'an), and you did not write "In the name of Allah, the Compassionate, the Merciful" between them?
Uthman replied: When the verses of the Qur'an were revealed to the Prophet (ﷺ), he called someone to write them down for him and said to him: Put this verse in the surah in which such and such has been mentioned; and when one or two verses were revealed, he used to say similarly (regarding them). (Surah) al-Anfal is the first surah that was revealed at Medina, and (Surah) al-Bara'ah was revealed last in the Qur'an, and its contents were similar to those of al-Anfal. I, therefore, thought that it was a part of al-Anfal. Hence I put them in the category of as-sab'u at-tiwal (the seven lengthy surahs), and I did not write "In the name of Allah, the Compassionate, the Merciful" between them.
The Messenger of Allah (ﷺ) sat and unveiled his face and said: “I take refuge in Allah, All-Hearing, All-Knowing from the accursed devil. Lo! They who spread the slander are a gang among you.”
Abu Dawud said: This is a rejected (munkar) tradition. A group of narrators have reported this tradition from al-Zuhri; but did not mention this detail. I am afraid the phrase concerning “seeking refuge in Allah” is the statement of Humaid.
The apostle of Allah (ﷺ) died, but he did not mention to us that surah al baraah ins a part of al-anfal.
Abu Dawood said: Al-sha’bl, Abu Malik, Qatadah, and Thabit b. ‘Umarah said: The prophet( may peace be upon him) did not write”In the name of Allah, the compassionate, the merciful” until Surah al-naml was revealed. This is the meaning of what they said. Further, this is a mursal traditional(omitting the name of the companion)