Kashif Ahmed Shahzada’s, The Quran’s Sole Authority, is the most comprehensive refutation of the traditionalist claim that hadith and sunnah are a requirement for islam. The work proves that the quran is the only source of divine guidance and that the messenger was bound by the message.
8/20 O you who believe! Obey Allah and His messenger and do not turn back from him while you hear.
As pointed out by Kashif Shahzada, the singular pronoun ‘him’ instead of the plural ‘us’ indicates that the obedience is one and the same. The messenger was not commanding anything different to what Allah was commanding. This is confirmed by:
4/80 Whoever obeys the messenger, he indeed obeys Allah, and whoever turns back, so We have not sent you as a keeper over them.
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However, a remainder of this equation is often picked up on by opponents of the quranist position: why is the messenger mentioned at all? It is a valid question, given the argument is that obeying Allah and obeying His messenger are in fact one and the same. Is not the inclusion of the messenger then a redundant detail?