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Farid , i was about to do a lengthy investigation on the following tradition, however upon closer examination there may not be a need to.
The first narration is from Musnad Ali bin Al-Ja’ad #152:
أنا شعبة ، عن الحكم قال : سمعت قيس بن أبي حازم ، وأبا الشعثاء ، عن عائشة قالت : يحرم من الرضاع ما أنبت اللحم والدم
Shu’ba told us, from Al-Hakam: I heard Qais bin Abi Haazim and Aba Al-Sha’thaa’, from A’isha (ra) say, “Only what causes the growth of the flesh and blood is what causes a foster-relationship through breastfeeding.”
This is a clear narration that A’isha (ra) does not believe that breastfeeding adults causes a foster-relationship with them.
Dear brother are you aware that our debate is weaning after two years? This is not a clear narration at all, because breastfeeding can make a two year old grow rapidly. It can make a ten year old grow. It can even make a Baligh boy grow upon drinking the milk during puberty. This does not prove that you can not give milk to an individual who has reached puberty. This was the massive flaw here. How can this be used for evidence?
What Aisha may mean is that the breastmilk should not be spat out by the child, but he needs to take it in and swallow it, so that he digests it and it goes into his make up:
Al-Tirmidhi Hadith 3173 Narrated by Umm Salamah
Allah's Messenger (saws) said, "The only suckling which makes marriage unlawful is that which is taken from the breast and enters the bowels, and is taken before the time of weaning."
Muwatta Malik: Yahya said that he had heard Malik say, "Suckling, however little or much when it is in the first two years, makes haram. As for what is after the first two years, little or much, it does not make anything haram. It is like food."
Al-Muwatta Hadith Hadith 30.14
Yahya related from Malik from Yahya ibn Said that Abdullah ibn Masud said, "There is only kinship by suckling in the first two years."
"Breastfeeding a grown-up has no effect,
because the breastfeeding which has an effect (of creating the relationship of mahram) is that which consists of five feedings or more within the first two years, before weaning. On this basis, if it happened that someone breastfed from his wife or drank her milk, he does not become her son. Fataawa Islamiyah, 3/338.