ENOfficial
‘Umar reported the Prophet (ﷺ) as saying, “A man should not be asked about why he beat his wife.” Abu Dawud and Ibn Majah transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ عُمَرَ رَضِيَ اللَّهُ عَنْهُ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «لَا يُسْأَلُ الرَّجُلُ فِيمَا ضَرَبَ امْرَأَتَهُ عَلَيْهِ» . رَوَاهُ أَبُو دَاوُد وَابْن مَاجَه
sunnah.com