Chapter 3 The Nature and Cleansing of An-Najasah (The Impurities)
22. Narrated Anas bin Malik
was asked about making vinegar out of wine. He said, "No
(it is prohibited)".
[Reported by Muslim, and At-Tirmidhi and the latter graded it Hasan-Sahih (fair and sound)]
 Making of vinegar from wine by adding something in it is prohibited.
23. Narrated Anas bin Malik
On the day of Khaibar, Allah's Messenger
commanded Abu Talha
to announce: "Allah and His Messenger
have prohibited for you (eating of) the flesh of the donkeys, for it is unclean."
[Agreed upon.] He is Zaid bin Sahl bin Al-Aswad bin Haram Al-Ansari An-Najari who was one of the senior Sahaba. He attended the 'Aqaba Covenant and all the battles. He fought bravely during the battle of Uhud and defended the Prophet till his hand got paralyzed. He also killed 20 men in the battle of Hunain. He died in the year 34 H. or 51 H.
 Leftover water of a donkey is pure and usable.
24. Narrated 'Amr bin Kharija
delivered a Khutba (religious talk) to us at Mina while mounted on his camel and its saliva was pouring on my
[Reported by Ahmad and At-Tirmidhi and the latter graded it Sahih (sound)] He is 'Amr bin Kharija bin Al-Muntafiq Al-Asadi. He was an ally of Abu Sufyan. He is regarded as being from the clan of Al-Ash'ar. He is among the Sahaba who settled in Sham and this Hadith was reported by the people of Basra.
 From this Hadith we come to know that the saliva of a Halal [lawful to eat] animal is also pure. This Hadith was approved by the Prophet
25. Narrated 'Aisha
used to wash the semen
and then go out for prayer in that (very) garment, and I could still see the trace of the washing on it.
In the version of Muslim: "I used to scrape it (the semen) off the garment of Allah's Messenger
and then he offered prayer with it."
In yet another version of Muslim: "Verily! I ('Aisha) used to scrape it (the semen) off his garment with my nails while it was dry". She is the daughter of Abu Bakr As-Siddiq and the Prophet married her 2 years before the Hijra in the month of Shawwal, but wedded her in 1 H. at the age of 9 years. She was very learned and reported many Ahadith. She died on 17 Ramadan 57 H or 58 H. Abu Huraira offered her Funeral prayer and she was buried at Al-Baqi'.
 There is a difference of opinion concerning the human semen, whether it is impure or not. Some religious elites consider it like saliva or nasal secretion, and according to others it is necessary to wash it. Former group gives its reason from the Hadith of scraping it when dried, and the latter group argues from the Hadith of washing the semen. In fact, semen is impure and it must be cleaned by washing, scraping, rubbing or wiping. (See the book Nail-ul-Autar by Imam Shaukani)
26. Narrated Abu As-Samh
said, "The urine of a baby girl should be washed off and the urine of a baby boy should be sprinkled with water)."
[Reported by Abu Da'ud and An-Nasa’i and Al-Hakim graded it Sahih (sound)]  His name is Iyya’d. He was a manumitted slave and servant of the Prophet . Ibn Abdul-Bar said that he was reported to be lost and nobody knew where he died.
 It means that there is difference in the urine of a boy and a girl. In the suckling period, girl's urine is more impure than the boy's urine.
27. Narrated 'Asma' bint Abu Bakr
said regarding menstruation blood that smears a garment, "She should scrape it, rub it with water, then wash it and then she may pray in it".
[Agreed upon]. She is the mother of' Abdullah bin Az-Zubair and the elder sister of' Aisha. She became a Muslim very early in Makka and migrated to Al-Madina. She died less than a month after the killing of her son Ibn Az-Zubair in 73H at the age of about 100 years, yet she neither lost a tooth nor had any mental problem.
28. Narrated Abu Huraira
said, "O Messenger of Allah,
suppose the (trace of) the blood does not go?" He said, "(Washing it with) water will suffice you and its trace won't harm you."
[Reported by At- Tirmidhi, and its Sanad (chain of narrators) is weak]. Khaula bint Yasar was a Sahabiya and Abu Salama bin 'Abdur-Rahman narrated the Hadith from her. Source: A b d u r r a h m a n.org