Ten trials to reveal his love

The Mishnah teaches that Avraham was tested with ten trials and withstood them all, "to make known how great was the love of Avraham Avinu." Pirkei d'Rebbi Eliezer counts them from his hiding as a child and the fiery furnace, through leaving home, famine and war, the bris and the sending away of Yishmael, up to the tenth and greatest, the Akeidah. Each time, it says, Hashem tested him to know his heart, whether he could hold fast and keep all of the Torah's mitzvos, and Avraham kept them all even before the Torah was given.