both ruling and wording were abrogated, supporters point to divine intervention into the memories of Muhammad and his companions causing them to forget a revelation. "Qur'ān-forgetting is clearly adumbrated in the Qur'ān", according to Burton, and couple of verses of the Quran talk of God taking away a revelation or causing it to be forgotten: A number of hadith also attest to the phenomenon of forgetting revelation — some describing the forgetting as "a natural failure" of Muhammad's or companions memory, and others as a "miraculous intervention" by God. One claims that entire suras which the Muslims had previously recited, would be discovered one morning to have been completely erased from memory. The question of whether not just some but all abrogated verses (mansukh) were deleted from the mushaf, (meaning that contrary to scholarly consensus, there is no "classic" mode of naskh, no #1. naskh al-hukm dūna al-tilāwa, because nothing included in the mushaf has been abrogated, no mansukh is found there) has been raised by Roslan Abdul-Rahim. According to Roslan Abdul-Rahim, one Bukhari hadith reports that the compiler of the mushaf himself — the third calif Uthman ibn Affan — declared that he would not "shift [any verse] from its place", indicating no verses would have been excluded from the Mushaf, even if abrogated. Hadith. Sahih al-Bukhari, Book 6: Volume 60: Hadith 53 Ibn Az-Zubair 'said to 'Uthman bin 'Affan (while he was collecting the Qur'an) regarding the Verse: "Those of you who die and leave wives ..." (2.240) "This Verse was abrogated by another Verse. So why should you write it? (Or leave it in the Qur'an)?" 'Uthman said. "O son of my brother! I will not shift anything of it from its place."' In addition, according to Abdul-Rahim, verse Q.2:106 and the report of Ubai questioning the Prophet, also suggest that naskh is not synonymous with forgetfulness of revelation. ('Abd al-Rahman b. Abza reports that on one occasion, the scribe Ubayy -- noticing that Muhammad had skipped a previously recited verse -- "asked if the Prophet had forgotten a verse or that it had been abrogated ...") Abrogation of Quran and Sunnah by one another Yet another way of classifying naskh is by what kind of revelation is abrogated and what kind is abrogating. Some scholars (a minority) believe that different types of revelation cannot abrogate each other — a part of the Sunnah can never abrogate