Hadith 4:366
Ibn ‘Ulayyah narrated to us, from Ibn ‘Awn, from Muhammad, who said: I asked him about fasting on Monday and Thursday. He said: I do not see any harm in it.
حدثنا بن علية عن بن عون عن محمد قال سألته عن صوم الاثنين والخميس قال لا أعلم به بأسا