What is the ruling on one who says that the Prophet Muhammad, may Allah’s peace and blessings be upon him, made a slip of the tongue, citing his saying to the man, "Come, O you concerning whom my Lord reprimanded me," and the revelation of Surat 'Abasa?

The scholars have agreed upon the infallibility of the Prophets in delivering the message and in abstaining from major sins. As for minor sins, they repent from them. It is obligatory to show reverence and respect when mentioning the Messenger (peace be upon him), and it is not permissible to insult him or belittle him in any way. Mentioning his human attributes or states as an example, or to imitate him, or for jest, is considered belittlement. However, mentioning them for a scholarly purpose or to understand what is permissible for them is outside of that, provided that it is with people of knowledge and those who understand the intentions. The story of Abdullah ibn Umm Maktum and similar instances of incidental human affairs, their ruling depends on the motive behind them and the speaker's intention. The narration of such stories must be restricted to those who are capable of understanding the discourse properly. For the Messenger (peace be upon him) is human, but only those human attributes that do not imply a defect are permissible in his regard. The story of the frowning was not a slip of the tongue, but rather an occupation with inviting the prominent leaders of the polytheists.