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QUESTION 2️⃣8️⃣

If someone is fasting and starts to bleed, does he break his fast or complete it? Can he donate blood or give blood samples whilst fasting?
Blood omitting from the body whilst fasting does not invalidate the fast except for cupping. If somebody cups, the correct opinion is that cupping breaks the fast.
This is a great difference of opinion between the scholars of Islam. The majority hold that cupping does not invalidate the fast.
However, the correct opinion and superior position is that it does invalidate the fast, based upon the statement of the Prophet (ﷺ):
“The one giving cupping and the one receiving it, both break their fast.”
[Abū Dāwūd, 2367, narrated by Abū Hurayrah and other than him. Reported and also authenticated by ibn Khuzaymah, 1964;1965. Some of the scholars of ḥadīth hold this narration to be abrogated by the narration of Anas b. Mālik which states that the Messenger of Allaah permitted it. Anas, himself, after that, cupped whilst he was fasting (Ad-Darquṭnī, 329].
Donating blood does not invalidate the fast. The omission of blood that invalidates the fast is the one that occurs during cupping based upon the statement of the Prophet (ﷺ) above.
We make an analogy with cupping as it relates to one intentionally extracting a substantial amount of blood from his body which in turn weakens it. This act invalidates the fast just like cupping.
As for blood donations, what is safer is to delay it until after iftar because usually a lot of blood is taken so therefore it becomes similar to cupping. The Islamic legislation does not differentiate between entities that are intertwined just as it does not combine two separate components.
There has been great discussion between the people of knowledge regarding whether cupping invalidates the fast of the cupper and the recipient.
No doubt, the safest option is to avoid cupping if possible until after sunset.
As for that which occurs unintentionally as nose bleeds, vaginal bleeding, injury to the body from a knife cut whilst chopping up meat, for example, or a glass cut, and similar occurrences, this does not invalidate the fast even if the bleeding was substantial.
Likewise, small omissions of blood do not affect one’s fast, like in the case of blood sampling, when it is required. This amount is excused because it is done out of necessity and it does not equate to those affairs that invalidate the fast as is established in the pure Islamic legislation. So, therefore, the fast is valid.
That which invalidates the fast is menstruation, post-partum, and cupping (as it relates to blood).
See 30 Questions and Answers on Fasting in Ramadaan by ‘Allāmah Abdul-‘Azīz Ibn Bāz, translated by ‘Abi ‘Abdir-Raḥmān Uways Onwordi at-Taweel
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