Donating blood to Blood Bank
Question

                Assalamu alikem Is it perimissible to donate blood to Blood Bank in the USA since most 
of the usage will be for non muslim?Also is it perimissible to recieve blood from Blood 
Bank knowing that it is mostly from non-muslim?Sheikh, I read your book. Jazak allah 
khir. 
We here love you in Allah. May allah reward you.
Salam
Praise be to Allah.wa 'alaikum us-salaamu wa-rahmat ullaahi wa-barakaatuh 
al-hamdu lillah 
It is permissible to receive blood from the Blood Bank even if the donor was a kaafir. Likewise, it is 
also permissible to donate blood to non-Muslims as long as they are not fighters of Islam. A fighter 
of Islam would be defined as one who fights Muslims with weapons or finances such fighting with his 
wealth, or helps such fighting. If one is not able to know for sure, then it suffices to act according to 
ghalabat ul-zann (one's best estimate or what is most likely and probable). 
ahabbak allaah ul-ladhi ahbabtani fih. 
(May Allaah love you as you have loved me for His sake.)