Sayyiduna Abu Hurayrah (may Allah be pleased with him) reports this saying of the Prophet (peace and blessings be upon him): "A person in Hell will call out, saying: 'Ya Hannan, ya Mannan' (that is, O Most Compassionate, O Bestower of abundant favours)."
Al-Tabarani recorded it in al-Mu'jam al-Awsat, and its chain is hasan (good).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الأدعية / 17277