Albert Barnes Commentary Psalms 89:51

"Wherewith thine enemies have reproached, O Jehovah, Wherewith they have reproached the footsteps of thine anointed." — Psalms 89:51 (ASV)

Wherewith thine enemies have reproached, O Lord - Have reproached you and me. With which they reproach your character and cause, and reproach me for having trusted to promises which seem not to be fulfilled. As the representative of your cause, I am compelled to bear all this, and it breaks my heart.

Wherewith they have reproached the footsteps of thine anointed - Of myself, as the anointed king. They have reproached my footsteps; that is, they have followed me with reproaches—treading along behind me. Wherever I go, wherever I put my foot down in my wanderings, I meet this reproach.