Sayyiduna Ibn Mas'ud (may Allah be pleased with him) narrates that I have observed thirty fasts of the month of Ramadan with the Prophet (peace and blessings be upon him) more frequently than I have observed twenty-nine (29) fasts.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 3871
Hadith Gradingحکم دارالسلام:حسن لغيره، وهذا إسناد ضعيف لجهالة دينار والد عيسي.