John Wesley on Psalms 89:51

Anointed - By whom he seems to understand either first the kings of Judah, the singular number being put for the plural; and by their footsteps may be meant either their ways or actions, or the memorials of their ancient splendor; or secondly the Messiah, whom the Jews continually expected for a long time, which being well known to many of the Heathens, they reproached the Jews, with the vanity of this expectation. And by the footsteps of the Messiah, he may understand his coming.