Abu Hurairah (RA) reported Allah's Apostle (ﷺ) as saying: He who took the freed slave as his ally without the consent of his previous master, there is upon him the curse of Allah and that of His angels and that of the whole mankind, and there will not be accepted from him his obligatory acts or supererogatory acts on the Day of Resurrection.
Related hadith on this topic
Explanation & Benefits
Shaykh Maulana Abdul Aziz Alvi
Hadith Gloss:
Vocabulary of the Hadith:
‘Adl:
measurement,
uprightness,
recompense,
ransom,
guarantor,
only weight,
price,
blood money recommendation,
bribery.
Source: Tuhfat al-Muslim: Commentary on Sahih Muslim, Page: 3791