For the source text click/tap here: Bava Batra 17
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The Gemara states that "over three people the Yetzer ha'Ra had no dominion" -- Avraham, Yitzchak, and Yakov, and some say even David ha'Melech.
If the Yetzer ha'Ra had no control over them, then how could they receive reward in Olam ha'Ba for the Mitzvos that they did in this world? Without the influence of the Yetzer ha'Ra, there is no option but to choose to do good, so they would have had no Bechirah, free choice. How, then, could they be rewarded for doing good?
TOSFOS explains that their Yetzer ha'Ra was not entirely curtailed. Rather, since Hash-m saw that they made great efforts to avoid sin, Hash-m helped them and did not let the Yetzer ha'Ra influence them.
We explore the suffering of these righteous figures which begs the very question of theodicy.