Fasting in Sha'ban

Anas bin Sirin narrated: We came to Sayyiduna Anas bin Malik (may Allah be pleased with him) on a Thursday. He called for his dining cloth and invited the people to eat. Some of those present ate and some did not eat. Then they came to him on a Monday and the same thing happened: he called for his dining cloth and invited the people to eat; some of them ate and some did not. Sayyiduna Anas (may Allah be pleased with him) said to them: "Perhaps you are followers of Monday, and perhaps you are followers of Thursday? The Prophet (peace and blessings be upon him) used to keep (voluntary) fasts and would not leave off fasting, until we would think that now the Prophet (peace and blessings be upon him) would not leave any voluntary fast; then he would start leaving voluntary fasts and would not fast, until we would think that he would not keep any voluntary fast this year. The most beloved fasts to the Prophet (peace and blessings be upon him) were those of Sha'ban." (Allamah al-Haythami says:) I say: Part of this report is narrated in the Sahih.
Imam Ahmad and Imam al-Tabarani in al-Mu'jam al-Awsat recorded it. Its chain contains a narrator, Uthman bin Rashid al-Thaqafi, and he is da'if (weak).

Sayyidah Aishah al-Siddiqah (may Allah be pleased with her) narrated: The Prophet (peace and blessings be upon him) used to fast the whole month of Sha'ban. Sayyidah Aishah (may Allah be pleased with her) said: I said: "O Messenger of Allah! Is the month most beloved to you for fasting Sha'ban?" The Prophet (peace and blessings be upon him) said: "Indeed Allah Almighty decrees for every soul the specific matters of that year (i.e. who is to die in that year; He conveys this information to the angels), so I love that when the command of my death comes, I am fasting." (Allamah al-Haythami says:) I say: Part of it is narrated in the Sahih.
Imam Abu Ya'la recorded it. Its chain contains a narrator, Muslim bin Khalid al-Zanji, about whom criticism has been made, although he has been declared trustworthy.

Sayyiduna Sahl bin Sa'd (may Allah be pleased with him) narrated: The Prophet (peace and blessings be upon him) used to keep voluntary fasts until we would say: "Now he will not leave any voluntary fast." Then he would leave voluntary fasts until we would say: "Now he will not keep any voluntary fast." And the Prophet (peace and blessings be upon him) kept the most fasts in Sha'ban.
Imam al-Tabarani recorded it in al-Mu'jam al-Kabir and al-Mu'jam al-Awsat. Its chain contains a narrator, Umar bin Suhban, and he is matruk (abandoned).

Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrated: The Prophet (peace and blessings be upon him) used to join Sha'ban to Ramadan.
Imam al-Tabarani recorded it in al-Mu'jam al-Awsat. Its chain contains a narrator, Yusuf bin Atiyyah, and he is da'if (weak).

Sayyiduna Abu Umamah (may Allah be pleased with him) narrated: The Prophet (peace and blessings be upon him) used to join Sha'ban to Ramadan (in fasting).
Imam al-Tabarani recorded it in al-Mu'jam al-Kabir, and its narrators are thiqat (trustworthy).

Sayyiduna Abu Tha'labah (may Allah be pleased with him) narrated: The Prophet (peace and blessings be upon him) used to fast Sha'ban and Ramadan in such a way that he joined the two together.
Imam al-Tabarani recorded it in al-Mu'jam al-Kabir. Its chain contains a narrator, al-Ahwas bin Hakim, about whom much has been said, although he has been declared trustworthy.

Sayyidah Aishah al-Siddiqah (may Allah be pleased with her) narrated: The Prophet (peace and blessings be upon him) used to fast three days of every month. Sometimes he would postpone them until the fasts of the whole year accumulated for him, and sometimes he would postpone them until he kept them in Sha'ban.
Imam al-Tabarani recorded it in al-Mu'jam al-Awsat. Its chain contains a narrator, Muhammad bin Abi Layla, about whom criticism has been made.