כִּי־אָ֤ז ׀ תִּשָּׂ֣א פָנֶ֣יךָ מִמּ֑וּם וְהָיִ֥יתָ מֻ֝צָ֗ק וְלֹ֣א תִירָֽא׃
Surely then shalt thou lift up thy face without spot; Yea, thou shalt be stedfast, and shalt not fear;
Rashi on Job
For then you would be sure that you could lift your face unblemished, for you would cause yourself to lift your face without any blemish. Because of this...
Rashi on Job
and you shall be strong Heb. מצק, strong, like (I Sam. 2:8), “the pillars of (מצקי) the earth,”