آداب النوم والاستيقاظ
Abu Hurayrah (may Allah be pleased with him) reported that the Messenger of Allah (may Allah's peace and blessings be upon him) said: "When anyone of you performs ablution, let him sniff water in his nose and then blow it out. Whoever cleans his private parts with stones, let him do so with an odd number of stones. Whoever wakes up from his sleep, let him wash his hands three times before putting them in the water vessel, for none of you knows where his hands were during his sleep." In another narration: "Let him sniff water in his nostrils." Another wording: "Whoever performs ablution, let him sniff water in his nose.”
عن أبي هريرة -رضي الله عنه- أن رسول الله -صلى الله عليه وسلم- قال: «إذا توضَّأ أحدُكُم فَليَجعَل في أنفِه ماءً، ثم ليَنتَنْثِر، ومن اسْتَجمَر فَليُوتِر، وإذا اسْتَيقَظَ أَحَدُكُم من نومِه فَليَغسِل يَدَيه قبل أن يُدْخِلهُما في الإِنَاء ثلاثًا، فإِنَّ أَحدَكُم لا يَدرِي أين بَاتَت يده». وفي رواية: «فَليَستَنشِق بِمِنْخَرَيه من الماء». وفي لفظ: «من توضَّأ فَليَسْتَنشِق».
شرح الحديث :
This Hadīth includes three main parts, and each has its own ruling: 1. Anyone starting to make ablution should put water in his nose, then blow it out. This is because the nose is part of the face that one is commanded to wash. There are numerous authentic Hadīths that establish its permissibility, because it is from the Shariah-required cleanliness. 2. Anyone who wants to clean his private parts from impurities with stones should do so with an odd number of stones; the least of which is three, and the most of which is what is necessary to fully clean the impurities off his body. 3. Anyone who wakes up from night sleep should not put his hand in the water vessel or touch anything until he washes them three times. One's hands are more likely to wander during night sleep, which is relatively long.The hand may touch some filth while one does not know about it. Hence, it is legislated to wash one's hands to make them clean.