Menachem Bluming Muses: Am I Required to Give Blood?
There are multiple biblical obligations to actively save the life of another and not stand by your brother’s blood (Vayikra 19:16). The Talmud in tractate Sanhedrin (73,a) teaches that one is obligated to be willing to endanger himself to some extent in order to save another's life, by doing such acts as jumping into a river to save someone who is drowning, or warding off wild predators or bandits, even though all of these acts involve some level of danger. A person is not obligated, however, to save his fellow if it puts him in great danger. The exact parameters of a great danger are discussed in Jewish Law but they are clearly greater than fighting off bandits or a wild animal. We would not want another to be overly cautious when considering whether or not to save our life and we must be willing to do the same for another, as long as the danger is not considered a great danger. To give a meal to a starving person is an obligation. To give a lobe of one's liver is permissi...