Muhammad bin Kathir bin Abi 'Ata' محمد بن كثير بن أبي عطاء الثقفي · Fasting (Kitab Al-Siyam)

We would not allow a man who was fasting to get himself cupped due to abomination of hardship.

The Prophet (ﷺ) used to kiss (me) during the month of fasting.

A huge basket containing twenty sa's (of dates) was brought.

The Prophet (ﷺ) as saying: If anyone dies when some fast is due from him (i.e. which he could not keep) his heir must fast on his behalf. Abu Dawud said: This applies to the fast which a man vows ; and this is the opinion of Ahmad b. Hanbal.

The Prophet (ﷺ) said: Do not fast on Saturday except what has been made obligatory on you; and if one of you can get nothing but a grape skin or a piece of wood from a tree, he should chew it.

The Messenger of Allah (ﷺ) said to me: The fast most liked by Allah is the one observed by Dawud (David), and the prayer dearer to Allah is the one offered by Dawud (David): he would sleep half the night, and stand (in prayer) one-third of it, and sleep one-sixth of it. He would go without fasting one day, and fast the other day.

The Messenger of Allah (ﷺ) said: He who does not determine to fast before dawn does not fast.