כִּֽי־עִמְּךָ֥ הַסְּלִיחָ֑ה לְ֝מַ֗עַן תִּוָּרֵֽא׃
因為唯有你那裡有赦免，好叫人敬畏你。
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.)