Sayyiduna Nu'aym bin Hammar (may Allah be pleased with him) narrates this saying of the Prophet (peace and blessings be upon him): "The Scale is in the Hand of the Most Merciful; He raises some peoples and lowers others."
Al-Bazzar recorded it, and its narrators are the narrators of the Sahih.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب الإيمان / 277