It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that the Prophet (peace and blessings be upon him) said: Fasting is a shield by which a person protects himself from Hell, and fasting is especially for Me, therefore I alone will give its reward.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 15264
Hadith Gradingحکم دارالسلام:حديث صحيح بطرقه وشواهده، وهذا إسناد حسن، ورواية عبدالله بن المبارك عن ابن لهيعة صالحة