Sunan an-Nasa'i 4885
It was narrated form 'Amr bin Shu'ainb, from his father, from his grandfather, that the Prophet said:
"Pardon matters that may deserve a Hadd punishment before you bring it to my attention, for whatever is brought to my attention, the Hadd punishment becomes binding." (Saif)
أَخْبَرَنَا مُحَمَّدُ بْنُ هَاشِمٍ، قَالَ حَدَّثَنَا الْوَلِيدُ، قَالَ حَدَّثَنَا ابْنُ جُرَيْجٍ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏
"‏ تَعَافَوُا الْحُدُودَ قَبْلَ أَنْ تَأْتُونِي بِهِ فَمَا أَتَانِي مِنْ حَدٍّ فَقَدْ وَجَبَ ‏"‏ ‏.‏