"We went out as a delegation and when we arrived with the Messenger of Allah ﷺ he accepted our oath of allegiance and we prayed with him. When he had finished the prayer, a man who looked like a Bedouin came to him and said: 'O Messenger of Allah, what do you think about a man who touched his penis during the Salah?' He said: 'It is just a part of you,' or 'a piece of you.'" (Using translation from Nasāʾī 165)  

خَرَجْنَا وَفْدًا حَتَّى قَدِمْنَا عَلَى رَسُولِ اللهِ ﷺ فَبَايَعْنَاهُ وَصَلَّيْنَا مَعَهُ فَلَمَّا قَضَى الصَّلَاةَ جَاءَ رَجُلٌ كَأَنَّهُ بَدَوِيٌّ فَقَالَ يَا نَبِيَّ اللهِ مَا تَرَى فِي رَجُلٍ مَسَّ ذَكَرَهُ فِي الصَّلَاةِ؟ قَالَ «وَهَلْ هُوَ إِلَّا مُضْغَةٌ مِنْكَ أَوْ بِضْعَةٌ مِنْكَ؟»