Tractate Sotah - Chapter 5 - Mishnah 5 סוטה פרק ה׳ משנה ה׳

On that day Rabbi Joshua ben Hyrcanus expounded: Job only served the Holy One, blessed be He, from love: as it is said, “Though he slay me, yet I will wait for him” (Job 13:15). And it is still evenly balanced whether to read “I will wait for him” or “I will not wait for him”? Scripture states, “Until I die I will maintain my integrity” (Job 27:5), this teaches that what he did was from love. Rabbi Joshua [ben Hananiah] said: who will remove the dust from your eyes, Rabban Yohanan ben Zakkai, since you had expounded all your life that Job only served the Omnipresent from fear, as it is said, “A blameless and upright man that fears God and shuns evil” (Job 1:8) did not Joshua, the student of your student, teach that what he did was from love?