Charles H. Spurgeon on Psalms 89:51

The footsteps, or foot soles, that is, the ways, life, actions, and sufferings, Ps 56:6 Ps 49:5. This referred to Christ, respecteth the oracle, Ge 3:15, that the Serpent should bruise the foot sole of the woman's seed; referred to Christians which follow his footsteps, in suffering and dying with him, that we may be glorified with him (1Pe 2:21 Ro 8:17); it notes the scandal of the Cross of Christ, "to the Jews a stumbling block, and to the Greeks foolishness." (1Co 1:23 1Pe 4:13-14.) The Chaldee understands it of the slackness of the footsteps. —Henry Ainsworth.