The Hadith about Surat Az-Zalzalah being equivalent to half of the Quran is inauthentic. Yet, some scholars of the Salaf followed this Hadith.

There is no proven report to indicate that the Prophet (blessings and peace of Allah be upon him) forbade eating again shortly after eating, but that is known from doctors. What is soundly narrated from the Prophet (blessings and peace of Allah be upon him) is that he urged people to eat little and not to eat more than they need.

The term Sunnah is applied to the guidance which is well-established in a general sense in all of the affairs of the Prophet (peace and blessings be upon him), meaning his path, his methodology and his way. Hadith refers to every incident that is attributed to the Prophet, even if he only did it once in his life, and even if it was narrated from him by only one person.

What is required of the Muslim is not to despair of mercy and not to feel safe from punishment; rather they should be in a state between hope and fear, because Allah has condemned those who feel safe from punishment and has condemned those who despair of His mercy.