Sayyiduna Hudhayfah (may Allah be pleased with him) narrates this saying of the Prophet (peace and blessings be upon him): "Whoever has his end sealed with fasting will enter Paradise."
Al-Bazzar recorded it. Ahmad recorded it as a longer report, which has already passed in the chapter on prompting the dying person, and its narrators have been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 5094