Sahih Muslim , Book 15, Hadith 4089 (USC-MSA) ⓘ

Abu Mas'ud reported that he had been beating his slave and he had been saying: I seek refuge with Allah, but he continued beating him, whereupon he said: I seek refuge with Allah's Messenger, and he spared him. Thereupon Allah's Messenger said: By Allah, God has more dominance over you than you have over him (the slave). He said that he set him free.

وَحَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، وَابْنُ، بَشَّارٍ - وَاللَّفْظُ لاِبْنِ الْمُثَنَّى - قَالاَ حَدَّثَنَا ابْنُ، أَبِي عَدِيٍّ عَنْ شُعْبَةَ، عَنْ سُلَيْمَانَ، عَنْ إِبْرَاهِيمَ التَّيْمِيِّ، عَنْ أَبِيهِ، عَنْ أَبِي مَسْعُودٍ، أَنَّهُ كَانَ يَضْرِبُ غُلاَمَهُ فَجَعَلَ يَقُولُ أَعُوذُ بِاللَّهِ - قَالَ - فَجَعَلَ يَضْرِبُهُ فَقَالَ أَعُوذُ بِرَسُولِ اللَّهِ ‏.‏ فَتَرَكَهُ فَقَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏ "‏ وَاللَّهِ لَلَّهُ أَقْدَرُ عَلَيْكَ مِنْكَ عَلَيْهِ ‏" ‏ ‏.‏ قَالَ فَأَعْتَقَهُ ‏.‏

This hadith has been narrated on the authority of Shu'ba with the same chain of transmitters, but made no mention of (these words) of his: I seek refuge with Allah, I seek refuge with Allah's Messenger.

وَحَدَّثَنِيهِ بِشْرُ بْنُ خَالِدٍ، أَخْبَرَنَا مُحَمَّدٌ، - يَعْنِي ابْنَ جَعْفَرٍ - عَنْ شُعْبَةَ، بِهَذَا الإِسْنَادِ وَلَمْ يَذْكُرْ قَوْلَهُ أَعُوذُ بِاللَّهِ أَعُوذُ بِرَسُولِ اللَّهِ صلى الله عليه وسلم ‏.‏