אור כשדים

Avraham almost gave up his life for his love of G-d. Avraham destroyed his father's place of worship because he wanted his father to believe in Hashem. Avraham's father was so into it that he was willing to kill his own son. They threw Avraham in a pit of fire to see if he will die. Avraham had faith in Hashem so he was pushed into the pit and he completely survived. Haran also jumped into the pit but he died. Haran died because he just wanted to stick with the winner of this fight, he didn't have the complete belief in Hashem that Avraham did.