Fasting: The ruling on blood donation
Q: What is the rule which judges that bleeding invalidates Sawm (fast)? How does it invalidate Sawm?
A: Bleeding that invalidates Sawm is that which is caused by cupping. The Prophet (peace be upon him) said in this regard: The Sawm of a man who cupped and a man who has himself cupped is broken. The same ruling is extended from cupping to other similar practices including any intentional bleeding which might cause a continuous discharge of blood as may weaken one's body. Actually, the Shari`ah (Islamic law) makes no distinction between similar cases and does differentiate between non-similar cases. Unintentional bleeding such as nosebleed or wounds caused by a knife on cutting meat, by treading on broken glass or the like, do not invalidate Sawm even if a lot of blood is discharged. The same applies to a short discharge of blood that does not have an effect like that of cupping, such as a sample extracted for blood analysis, which does not invalidate Sawm.
Fatwas of Ibn Baz
(Part No. 15; Page No. 273)
Volume Number 15,The Book of Fasting, Nullifiers of fasting and causes of expiation, the ruling on blood donation
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