A person asked Hazrat Aisha about the voluntary fasts of the Prophet (peace be upon him), so she replied that the Prophet (peace be upon him) used to fast in the month of Sha'ban and paid special attention to fasting on Mondays and Thursdays.
Hadith Referenceمسند احمد / مسند النساء / 24584
Hadith Gradingحکم دارالسلام:حديث صحيح، وهذا إسناد ضعيف لأجل بقية ، فإنه يدلس تدليس التسوية