Narrated Abu Huraira (rad):

Allah’s Messenger (ﷺ) said: “When one of you wakes up from his sleep, he must not put his hand in a utensil till he washed it three times, for he does not know where his hand was (while he slept)”. [Agreed upon. This is Muslim’s version].

وَعَنْهُ: { إِذَا اِسْتَيْقَظَ أَحَدُكُمْ مِنْ نَوْمِهِ فَلَا يَغْمِسُ يَدَهُ فِي اَلْإِنَاءِ حَتَّى يَغْسِلَهَا ثَلَاثًا فَإِنَّهُ لَا يَدْرِي أَيْنَ بَاتَتْ يَدَهُ } مُتَّفَقٌ عَلَيْهِ.‏ وَهَذَا لَفْظُ مُسْلِم ٍ [1]‏ .‏