Hazrat Mujahid used to fast on Mondays and Thursdays. Then he declared it disliked (makruh).

Hazrat Mawla Usama says that Hazrat Usama used to go to Mecca to his wealth and livestock. There he used to fast on Mondays and Thursdays. I said to him that you are old and still fast on Mondays and Thursdays. He replied that I saw the Messenger of Allah (peace and blessings be upon him) fasting on these two days, so I asked him why he fasts on Mondays and Thursdays. He said that on these days deeds are presented before Allah Almighty.

Hazrat Muhammad bin Ibrahim states that Hazrat Usama bin Zaid used to fast on many days of the week and would fast continuously. Someone asked him why he did not fast on Mondays and Thursdays. After that, he also started fasting on these two days.

Hazrat Abdullah used to fast on Mondays and Thursdays.

Hazrat Ibn Abbas (may Allah be pleased with both of them) was asked about fasting on Mondays and Thursdays, so he said that it is disliked to specify a particular day for fasting. In the narration of Hazrat Yazid, it is mentioned that one should specify a day, and when that day comes, he should fast.

Hazrat Ali (may Allah be pleased with him) used to fast on Mondays and Thursdays.

Hazrat Mujahid states that the Holy Prophet (peace and blessings be upon him) used to fast on Mondays and Thursdays.

It is narrated from Hazrat Abu Huraira that the Messenger of Allah, peace and blessings be upon him, said: None of you should fast on Friday unless he fasts a day before it or a day after it.

Hazrat Abdullah bin Amr (may Allah be pleased with him) narrates that once the Noble Prophet (peace and blessings be upon him) came to Hazrat Juwayriya bint Harith on a Friday. She was fasting. The Noble Prophet (peace and blessings be upon him) asked her, "Did you fast yesterday?" She replied, "No." He asked, "Do you intend to fast tomorrow?" She replied, "No." The Prophet (peace and blessings be upon him) said, "Then break your fast."

Hazrat Junadah Azdi says that eight of us from the tribe of Azd came to the service of the Prophet (peace be upon him) on Friday. All of us were fasting. The Prophet (peace be upon him) had food brought and placed before us, so we said that we were fasting. He asked, "Did you fast yesterday?" We replied, "No." He asked, "Will you fast tomorrow?" We replied, "No." Then he said, "Break your fast." Then he went for the Friday prayer. When he sat on the pulpit, he asked for water and drank it. People were watching him. In fact, he wanted to show them that he (peace be upon him) did not fast on Fridays.