[Machine] The Messenger of Allah ﷺ said, "When one of you wakes up, he should not put his hand into his vessel or his water container, or he said, into his purification water, until he washes it three times. Verily, he does not know where his hand spent the night."  

قَالَ رَسُولُ اللهِ ﷺ إِذَا اسْتَيْقَظَ أَحَدُكُمْ فَلَا يُدْخِلْ يَدَهُ فِي إِنَائِهِ أَوْ قَالَ فِي وَضُوئِهِ حَتَّى يَغْسِلَهَا ثَلَاثَ مَرَّاتٍ فَإِنَّهُ لَا يَدْرِي أَيْنَ بَاتَتْ يَدُهُ  

"The Messenger of Allah ﷺ said: 'When any one of you gets up after (sleeping) at night, let him not put his hand into the vessel until he has poured water on it two or three times, for none of you knows where his hand spent the night.'" (Using translation from Nasāʾī 441)   

قَالَ رَسُولُ اللهِ ﷺ إِذَا قَامَ أَحَدُكُمْ مَنَ اللَّيْلِ فَلَا يُدْخِلْ يَدَهُ فِي الْإِنَاءِ حَتَّى يُفْرِغَ عَلَيْهَا مَرَّتَيْنِ أَوْ ثَلَاثًا فَإِنَّهُ لَا يَدْرِي أَيْنَ بَاتَتْ يَدُهُ وَكَذَلِكَ قَالَهُ ابْنُ هُرْمُزَ عَنْ أَبِي هُرَيْرَةَ