Abū Hurayrah BP_HIM said, “The Emissary of Allāh BPBUH said, ‘Allāh does not accept the prayer of any one of you having committed ḥadath until he makes wuḍū.’” [Al-Bukhārī (al-Fatḥ, 1/206) and Muslim (#245)].
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Al-Nawawī says in al-Majmūʿ (2/3), “...as for that which comes out of the two private parts---then it breaks wuḍū according to Allāh's BSWT saying, (Aw jaa'a ahadukum min al ghaa'it...) (...or one of you comes from offices of nature...) [Soorat-ul-Maa'idah 5:6] along with his BPBUH saying **There is no wuḍū except from a sound or a smell.” [ṣaḥīḥ and has preceded (Ṣaḥīḥ al-Jāmiʿ (7443)].
He concludes, “So that which comes out of the front or back part of a man or woman breaks the wuḍū---whether excretion, urine, or wind---or a worm or pus or blood or stones or anything else, and there is no difference in that for something which happens normally or rarely.”
- ʿAlī bin ʿAbī Ṭālib BP_HIM said, “The Emissary of Allāh BPBUH said, ‘The eye is the drawstring for the anus, so he who sleeps then let him make wuḍū.’” [Abū Dāwūd (#203), Ibn Mājah (#477), and Aḥmad. Declared as ṣaḥīḥ by Shaykh al-Albānī].
In the ḥadīth is evidence that sleep does not in itself something that breaks wuḍū, however the wuḍū is nullified if it is possible for something to come out from the anus. However, if that is restricted, e.g. by sitting flat on the earth, then that is not the case.
That is the intellect going away by any means because of insanity, fainting, or intoxication---as in this condition he does not know whether his wuḍū is broken or not. This is the saying of the great majority of scholars. (Sharḥ Ṣaḥīḥ Muslim (4/74) and al-Mughnī (1/164)).
- Abū Hurayrah BP_HIM said, “The Emissary of Allāh BPBUH said, ‘If one of you touches his penis and there is no veil between him and it nor any cover, then wuḍū has become obligatory for him.’” [Al-Ḥākim (1/138) and others. Shaykh al-Albānī said that it is ḥadīth ṣaḥīḥ.]
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Busrah BP_HER said, “The Emissary of Allāh BPBUH said, ‘If one of you touches his penis then let him make wuḍū.’” [al-Tirmidhī (1/18) who said it is ḥasan ṣaḥīḥ. It was declared as ṣaḥīḥ by Aḥmad, al-Bukhārī, and Ibn Maʿīn (Lumʿāt al-Tanqīḥ Sharḥ Mishkāh al-Maṣābīḥ, #319). Others also narrate it as authentic.]
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Ṭalq ibn ʿAlī BP_HIM said, “The Emissary of Allāh BPBUH was asked about a man's touching his penis. ‘Should he make wuḍū?’ He BPBUH replied, ‘And isn't it but a part of him?’” [al-Tirmidhī (#85) and he said: And this is the best of what is reported in this regard]. Shaykh al-Albānī said, “Its isnād is ṣaḥīḥ, and this (the view that it doesn't break the wuḍū) is established as being that of a group of the Ṣaḥābah, from them: Ibn Masʿūd, ʿAmmār bin Yāsir, and because of these, Imam Aḥmad gave the choice between this and the one before it. Shaykh al-Islām Ibn Taymīyyah harmonized the two carrying the first to mean if he touched it with desire and this upon the touching without desire---and there is in this ḥadīth that which gives that impression and it is his BPBUH saying a part of him.” [al-Mishkāh al-Maṣābīḥ, notes on Nos. 319--320.]
- Jābir bin Samurah BP_HIM narrates that a man asked the Emissary of Allāh BPBUH, “Should I make wuḍū because of the meat of sheep?” He BPBUH said, “If you wish make wuḍū and if you wish then do not make wuḍū.” He said, “Should I make wuḍū from the meat of the camel?” He BPBUH said, “Yes, make wuḍū from the meat of the camel.” He asked, “May I pray in sheep-pens?” He BPBUH said, “Yes.” He asked, “May I pray in the stalls of camels?” He BPBUH said, “No.” [Reported by Muslim (1/189)].
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A man's touching a woman without desire does not break the wuḍū. ʿĀʾishah BP_HER says, “The Emissary of Allāh BPBUH prayed and I was lying in front of him as in front of a janāzah, so when he wished to prostrate I pulled up my leg. [al-Bukhārī and Muslim].
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And in the same way a woman's touching a man without desire does not break wuḍū as is established from ʿĀʾishah BP_HER, “I didn't find the Prophet BP_HER one night so I tried to find him with my hand---and my hand fell upon his feet which were raised up as he was making prostration.” [Muslim (3/203) and al-Nasāʾī (1/101)].
So we see from these two ḥadīth that merely touching does not break the wuḍū. And Allāh knows best.
The author of al-Taʿlīqāt al-Salafīyyah ʿalā Sunan al-Nasāʾī (1/23) says concerning he pushed me with his foot, “It is well-known that that is a touching without desire. And so the author uses it as a proof that touching without desire does not break the wuḍū. As for the touching with desire---its proof is that the wuḍū is not broken until a proof is established that it does indeed break it---and this is enough of a proof to show that it doesn't break the wuḍū for the one who holds that view---and above and beyond that is a further proof that it doesn't break the wuḍū is the ḥadīth of kissing as kissing is not normally free from touching with desire.”
The author of Awn al-Maʿbūd (1/69) says regarding her BP_HER saying, he kissed me and did not make wuḍū, “It contains a proof that touching a woman does not break the wuḍū as kissing is part of touching and the Prophet BPBUH did not make wuḍū (before praying). And this (that touching a woman even with desire doesn't break the wuḍū) is the saying of ʿAlī, Ibn ʿAbbās, ʿAṭāʾ bin Ṭāwūs, Abū Ḥanīfah, and Sufyān al-Thawrī. And this ḥadīth is (by itself) ḍaʿīf but is supported by other narrations, and it is mursal. However, al-Dāraquṭnī connects it. Thus, it is an ṣaḥīḥ ḥadīth, in-shā-Allāh.” (See Naṣb al-Rāyah, 1/70).
The author of al-Mughnī (1/190) says, “The touching is not in itself something which breaks wuḍū but breaks wuḍū as it leads to prostatic fluid or semen being emitted---so the condition which leads to breaking of the wuḍū is considered---and that is when there is desire.”
Summary: That when a man and woman are safe from anything being emitted which breaks wuḍū---then their wuḍū is not broken; and it is preferable to be on the safe side, as they may not be safe from such emissions in the condition of desire. And Allāh BSWT knows best.