This hadith highlights some points of Islamic etiquette and teachings. In it, the Prophet (blessings and peace of Allah be upon him) says: When one if you does wudu’, meaning that when he wants to do wudu’ and starts to do it, then let him put water in his nose by sniffing it up until it gets into his nose, then let him push it out with a forceful exhalation, so as to clean out any dirt that may be inside the nose. And whoever cleans himself with pebbles, meaning that he wants to wipe his front or back passage after relieving himself by using pebbles, let him use an odd number, so let him use three or five pebbles, and so on, so that the place will be thoroughly cleansed of dirt. Then the Prophet (blessings and peace of Allah be upon him) advised the one who wakes up from his sleep to wash his hand and purify it with water before he puts it into the vessel containing the water with which he will do wudu’. That is because the sleeper does not know where his hand spent the night whilst he was sleeping, and he cannot be certain that it did not become unclean by touching some impurity on the body. This is a precaution so that the water will not become contaminated with something that may have got stuck to his hand whilst he was sleeping. This hadith encourages us to take precautions and be careful in the case of doubt and uncertainty, and to take measures to protect and maintain the original state of water, which is originally clean and pure. It indicates that one may use ambiguous words when it is not appropriate to be blunt or explicit. So the Prophet (blessings and peace of Allah be upon him) said, “One of you does not know where his hand spent the night,” instead of saying something explicit..