Narrated Ibn 'Umar (RA):
So-and-so asked and said, "O Allah's Messenger (ﷺ) , what do you think if one of us finds his wife committing adultery, how should he act? If he talks he would talk about a grievous affair, and if he keeps silent he would keep silent about something similar (a grievous affair)." He gave no answer. Afterwards he came to him (ﷺ) and said, "I have been afflicted with the very problem which I had asked you about." Then Allah revealed the verses of Surat an-Nur (the Light). He then recited them to him and exhorted, admonished and informed him that the punishment of this world is easier than that of the Hereafter. He said, "No, by Him Who sent you with the Truth, I have not lied against her." He then summoned the woman and exhorted her in the same way. She said, "No, by Him Who sent you with the Truth, he is a liar." He began with the man; and he (the man) bore witness four times with an oath by Allah; he then did the same with the woman, then he separated them. [Reported by Muslim].
عَنِ اِبْنِ عُمَرَ رَضِيَ اَللَّهُ عَنْهُمَا قَالَ: { سَأَلَ فُلَانٌ فَقَالَ: يَا رَسُولَ اَللَّهِ! أَرَأَيْتَ أَنْ لَوْ وَجَدَ أَحَدُنَا اِمْرَأَتَهُ عَلَى فَاحِشَةٍ, كَيْفَ يَصْنَعُ? إِنْ تَكَلَّمَ تَكَلَّمَ بِأَمْرٍ عَظِيمٍ, وَإِنْ سَكَتَ سَكَتَ عَلَى مِثْلِ ذَلِكَ! فَلَمْ يُجِبْهُ, فَلَمَّا كَانَ بَعْدَ ذَلِكَ أَتَاهُ, فَقَالَ: إِنَّ اَلَّذِي سَأَلْتُكَ عَنْهُ قَدِ ابْتُلِيتُ بِهِ, فَأَنْزَلَ اَللَّهُ اَلْآيَاتِ فِي سُورَةِ اَلنُّورِ, فَتَلَاهُنَّ عَلَيْهِ وَوَعَظَهُ وَذَكَّرَهُ، وَأَخْبَرَهُ أَنَّ عَذَابَ اَلدُّنْيَا أَهْوَنُ مِنْ عَذَابِ اَلْآخِرَةِ. قَالَ: لَا, وَاَلَّذِي بَعَثَكَ بِالْحَقِّ مَا كَذَبْتُ عَلَيْهَا, ثُمَّ دَعَاهَا اَلنَّبِيُّ - صلى الله عليه وسلم -فَوَعَظَهَا كَذَلِكَ, قَالَتْ: لَا, وَاَلَّذِي بَعَثَكَ بِالْحَقِّ إِنَّهُ لَكَاذِبٌ, فَبَدَأَ بِالرَّجُلِ, فَشَهِدَ أَرْبَعَ شَهَادَاتٍ, ثُمَّ ثَنَّى بِالْمَرْأَةِ, ثُمَّ فَرَّقَ بَيْنَهُمَا. } رَوَاهُ مُسْلِم ٌ [1] .