Abu Qatada reported,

The Messenger of Allah ﷺ was asked about his fasting, and the Messenger of Allah ﷺ became angry.So Umar said, "We are pleased with Allah as our Lord, with Islam as our religion, with Muhammad as our Messenger, and with our pledge of allegiance as our pledge."Then he was asked about fasting perpetually. He said, "He has neither fasted nor broken his fast," or "He did not fast and did not break his fast."Then he was asked about fasting two days and breaking fast one day. He said, "Who can manage that?"Then he was asked about fasting one day and breaking fast two days. He said, "I wish Allah would give us strength for that."Then he was asked about fasting one day and breaking fast one day. He said, "That is the fast of my brother Dawud ."Then he was asked about fasting on Monday. He said, "That is a day on which I was born, and the day on which I was sent," or "on which revelation came down to me."Then he said, "Fasting three days of every month, and from Ramadan to Ramadan, is like fasting the entire year."Then he was asked about fasting on the day of Arafah. He said, "It expiates the past year and the coming year."Then he was asked about fasting on the day of Ashura. He said, "It expiates the past year."In this hadith, in Shuba's narration, it says, "And he was asked about fasting on Monday and Thursday." But we have remained silent about the mention of Thursday, since we consider it to be an error.

حدثنا محمد بن المثنى ومحمد بن بشار واللفظ لابن المثنى قالا حدثنا محمد بن جعفر حدثنا شعبة عن غيلان بن جرير سمع عبد الله بن معبد الزماني

عن أبي قتادة الأنصاري رضي الله عنه

أن رسول الله ﷺ سئل عن صومه قال فغضب رسول الله ﷺ فقال عمر رضي الله عنه رضينا بالله ربا وبالإسلام دينا وبمحمد رسولا وببيعتنا بيعة قال فسئل عن صيام الدهر فقال لا صام ولا أفطر أو ما صام وما أفطر قال فسئل عن صوم يومين وإفطار يوم قال ومن يطيق ذلك قال وسئل عن صوم يوم وإفطار يومين قال ليت أن الله قوانا لذلك قال وسئل عن صوم يوم وإفطار يوم قال ذاك صوم أخي داود عليه السلام قال وسئل عن صوم يوم الاثنين قال ذاك يوم ولدت فيه ويوم بعثت أو أنزل علي فيه قال فقال صوم ثلاثة من كل شهر ورمضان إلى رمضان صوم الدهر قال وسئل عن صوم يوم عرفة فقال يكفر السنة الماضية والباقية قال وسئل عن صوم يوم عاشوراء فقال يكفر السنة الماضية وفي هذا الحديث من رواية شعبة قال وسئل عن صوم يوم الاثنين والخميس فسكتنا عن ذكر الخميس لما نراه وهما