It is narrated from Hazrat Aisha (may Allah be pleased with her) that I used to make up my missed fasts of Ramadan only in the month of Sha'ban until the Prophet (peace and blessings be upon him) passed away.
Hadith Referenceمسند احمد / مسند النساء / 25462
Hadith Gradingحکم دارالسلام:حديث صحيح، عبدالبهي اختلف فى سماعه من عائشة، خ: 1950، م: 1146