It is narrated from Hazrat Aisha that sometimes the Prophet (peace be upon him) would fast so much that we would say, "Now the Prophet (peace be upon him) will continue to fast," and sometimes he would leave off fasting so much that we would say, "Now the Prophet (peace be upon him) will continue to leave off fasting." And the Prophet (peace be upon him) used to recite Surah Bani Isra'il and Surah Az-Zumar every night.
Hadith Referenceمسند احمد / مسند النساء / 24908
Hadith Gradingحکم دارالسلام:حديث صحيح دون قوله: كان يقرأ، فحسن لأجل مروان