This is called sacrifice

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A
person narrates: “I was passing by injured ones in one of the battles. I saw
an injured person lying on the ground taking his final breaths. I knew that
excessive blood loss makes a person feel very thirsty. Hence when that
injured one looked at me and said something, I immediately thought that
he was asking for water. I fetched a glass of water for him but he pointed
out that his brother was lying in the same state and asked me to give that
water to him first. When I went to that person he pointed to another
thirsty person to me and told me to give the water to him first. I went
near that person (some narrators have recorded the number of injured
ones as three and others have recorded as ten). Before I could reach the
last injured, he breathed his last. Then I turned towards the second-last
only to find that he too had passed away. Similarly, when I reached the
first, he was already dead.” Thus, the narrator could not provide water
to any of them because whenever he took water to an injured person, he
used to ask him to go to the next one. This is called sacrifice, which is the
best expression of man’s spiritual love.