Hadith on Curses: The Prophet reprimands Abu Bakr for cursing his slaves, so Abu Bakr emancipates them

Aisha reported: Abu Bakr once cursed some of his slaves, so the Prophet, peace and blessings be upon him, said, “O Abu Bakr! Those who curse or those who are true? No, by the Lord of the Ka’bah!” The Prophet said it two or three times. On that day, Abu Bakr freed some of his slaves. Then the Prophet came to him and he said, “Do not do it again.”

Source: Al-Adab Al-Mufrad 319

Grade: Sahih (authentic) according to Al-Albani

قَالَ عَائِشَةُ أَنَّ أَبَا بَكْرٍ لَعَنَ بَعْضَ رَقِيقِهِ فَقَالَ النَّبِيُّ صلى الله عليه وسلم‏ يَا أَبَا بَكْرٍ اللَّعَّانِينَ وَالصِّدِّيقِينَ‏؟‏ كَلاَّ وَرَبِّ الْكَعْبَةِ مَرَّتَيْنِ أَوْ ثَلاَثًا فَأَعْتَقَ أَبُو بَكْرٍ يَوْمَئِذٍ بَعْضَ رَقِيقِهِ ثُمَّ جَاءَ النَّبِيُّ صلى الله عليه وسلم فَقَالَ‏ لا أَعُودُ

319 الأدب المفرد البخاري بَابُ مَنْ لَعَنَ عَبْدَهُ فَأَعْتَقَهُ

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