כִּֽי־עִמְּךָ֥ הַסְּלִיחָ֑ה לְ֝מַ֗עַן תִּוָּרֵֽא׃
װאָרום בײַ דיר איז פֿאַרגעבונג, דרום װערסטו געפֿאָרכט.
Rashi
For forgiveness is with You You did not give permission to an agent to forgive, as it is said (Exod. 23:21): “for he will not forgive your transgression.”
Rashi
in order that You be feared for this, so that no man will rely on the forgiveness of another. (I found this.)