Sayyiduna Abu Musa al-Ash'ari (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him): "When Allah Almighty conceals a servant's sin in this world, then on the Day of Resurrection He will not put that servant to shame on account of that sin."
Al-Bazzar and al-Tabarani recorded it; its chain contains a narrator, Umar bin Sa'id al-Abahh, who is da'if (weak).
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب التوبة / 17476