Abu Karayb, Muhammad bin al-'Ala' محمد بن العلاء - أبو كريب · The Book of Fasting

he asked the Messenger of Allah about the verse "Until the white thread (light) of dawn appears to you distinct from the black thread (darkness of night)." He said: "It is the blackness of the night and the whiteness of the day." '

the Messenger of Allah said, concerning one who fasted for the rest of his life: "He neither fasted nor broke his fast." 'Ata said: "someone who heard him told me that Ibn 'Umar (said) that the Prophet said: 'Whoever fasts every day of his life, then he has not fasted."