Is a Muslim permissible to save a disbeliever from critical condition or from death? Lets see the saying of our scholars.
If a Muslim travels. Then in the middle of the road he finds a non-Muslim (disbeliever) man in critical condition. Because he is very hungry or very thirsty (or death). Can he save him? And is the act rewarding?
Al Lajnah Ad Daimah lil Buhuth wal Ifta answers:
Yes, of course you can save him from death, and moreover, this is recommended. And Allah will reward this practice.
This is based on the generality of the hadith which in Sahih Bukhari chapter Musaqah (2234), Sahih Muslim chapter As Salam (2244), Sunan Abu Daud chapter Al Jihad (2550), Musnad Ahmad (2/375), Muwatha ‘Malik (1729), the Prophet sallallaahu ‘alaihi Wasallam says:
في كل كبد رطبة أجرا
“In every good deed towards everything that have a soul, there is a reward“
Because good practice such as this sometimes has a good effect. Sometimes it can be a reason for non-Muslims (disbeliever) if they know that Islam teaches good to everyone.
Wabillahi at taufiq washallallahu’ala Nabiyyina Muhammad wa alihi wa shahbihi wasallam.
So, saving disbeliever from critical condition is permissible. More than that, this act considered as good deed and rewarded.