What is the ruling on one who believes that Yusuf or Dawud (peace be upon them) were more beautiful or had a better voice than Prophet Muhammad (peace be upon him), or that Allah did not speak to Prophet Muhammad during the Isra and Mi'raj journey as He spoke to Musa (peace be upon him)? Do these beliefs expel their holder from Islam?

Prophet Muhammad, peace and blessings be upon him, is the most beautiful of creation, perfect in physique and character. He is the most handsome of all prophets in appearance and voice. It is incorrect to believe that Yusuf (Joseph) was more beautiful than him or that Dawud (David) had a more beautiful voice than him. The Hadith of the Mi'raj (Ascension) which mentions that Yusuf was given half of beauty should be understood as referring to someone other than the Prophet, peace and blessings be upon him, or that Yusuf was given half of the beauty that Prophet Muhammad possessed, or that Yusuf was endowed with half of beauty uniquely, and people shared the other half. Allah's speech to our Prophet Muhammad, peace and blessings be upon him, is affirmed in authentic hadiths, and denying it is a denial and a fabrication against an established report from the Prophet, peace and blessings be upon him. Denying that Allah spoke to Moses is disbelief (kufr). As for denying an authentic singular report (khabar ahad) from the Messenger, peace and blessings be upon him, it is indeed disbelief if one believes in its authenticity and is not interpreting it. However, it does not apply to a new convert to Islam, or one who grew up in a remote wilderness, or one who has not received the texts, or heard them but did not find them established, or found them contradicted by another argument that necessitated their interpretation. The innovation (bid'ah) that constitutes disbelief is the denial of a matter that is unanimously agreed upon, transmitted widely (mutawatir), and known as a necessity of the religion, or believing in something that Allah, His Messenger, and His Book are transcendent above.