Sayyiduna Uqbah bin Amir (may Allah be pleased with him) narrates: The Prophet (peace and blessings be upon him) said: "Whoever does not accept the concession of Allah Almighty bears sins like the mountains of Arafah."
Ahmad and al-Tabarani in al-Mu'jam al-Awsat recorded it. Its chain contains Ruzayq al-Thaqafi; I have not found anyone who criticised him or declared him trustworthy, and the rest of its narrators are thiqat (trustworthy).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الصيام / 4937