Sayyiduna Bashir (may Allah be pleased with him) says: I asked the Messenger of Allah (peace and blessings be upon him): I will fast on Friday and will not speak to anyone on that day? The Prophet (peace and blessings be upon him) said: "Do not fast on Friday, unless you fast on several days and Friday happens to be among them (then there is no harm). As for your issue of not speaking to anyone, by my life! Speaking good and forbidding evil is better for you than remaining silent."

It is narrated from Sayyiduna Abu Hurairah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "Do not fast on the day of Friday, unless you fast a day before it or a day after it as well."

Ubaid A’raj says: My grandmother narrated to me that she went to the Messenger of Allah (peace and blessings be upon him) while he was having lunch; it was a Saturday. The Prophet (peace and blessings be upon him) said:“Come, eat food.”She said: I am fasting. The Prophet (peace and blessings be upon him) said:“Did you fast yesterday?”She said: No. The Prophet (peace and blessings be upon him) said:“Then eat food, for you will get neither reward nor punishment for fasting only on Saturday.”

It is narrated from Sayyiduna Abu Umamah (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) said: "Do not fast on Saturday, except for obligatory fasts. If you find nothing but the bark of a tree, then eat that (to show that you are not fasting)."

It is narrated from Sayyiduna Abdullah bin Amr bin al-As (may Allah be pleased with him) that a man came to the Prophet Muhammad (peace and blessings be upon him) and said: O Messenger of Allah! Will you permit me to be castrated? The Prophet (peace and blessings be upon him) said: "The castration of my Ummah is fasting and standing (in prayer)."

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that a woman came to the Noble Prophet (peace and blessings be upon him) and mentioned her sister, who had vowed to fast for a month, but she passed away during a sea journey and was unable to fast. The Messenger of Allah (peace and blessings be upon him) said: "You should fast on behalf of your sister."

It is narrated from Sayyiduna Abu Hurairah, may Allah be pleased with him, that the Noble Prophet, peace and blessings be upon him, said: "The fast will be on the day when you (all) fast, the breaking of the fast will be on the day when you (all) break the fast, and the sacrifices will be on the day when you (all) offer sacrifices."

It is narrated from Sayyidah Aisha (may Allah be pleased with her) that when the Messenger of Allah (peace and blessings be upon him) would be doubled over at night due to intense hunger, he would recite this supplication: "There is no deity worthy of worship except Allah, the One and the Mighty, the Lord of the heavens, the earth, and all that is between them. He is the Dominant and the Forgiving."

Narrated from Sayyiduna Anas Sa'd (may Allah be pleased with him) that when the Prophet (peace and blessings be upon him) was residing, he would observe i'tikaf during the last ten days of Ramadan, and if he was on a journey during those days, then in the following year he would observe i'tikaf for twenty days.

It is narrated from Sayyidah Aisha (may Allah be pleased with her) that the effort the Prophet (peace and blessings be upon him) used to exert in worship during the last ten days (of Ramadan), he did not exert in any other ten days.