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Hadith qudsi Riyad as-Salihin 1587
The Prophet (ﷺ) said, "Allah, the Exalted, says: 'I will contend on the Day of Resurrection against three (types of) people: One who makes a covenant in My Name and then breaks it; one who sells a free man as a slave and devours his price; and one who hires a workman and having taken full work from…
" قال الله تعالى: ثلاثة أنا خصمهم يوم القيامة : رجل أعطى بي ثم غدر، ورجل باع حرًا فأكل ثمنه، ورجل استأجر أجيرًا، فاستوفى منه، ولم يعطه أجره"