Charles H. Spurgeon on Psalms 109:18

We must not pass this verse without remarking that there is an allusion in its tone to Nu 5:21-22,24 the unfaithful wife. Her curse was to penetrate into her bowels; "the water that causeth the curse shall enter into her"; and such a curse comes on unfaithful Judas, who violates his engagement to the Lord, and upon Israel at large also, who have departed from him "as a wife treacherously departeth from her husband", and have committed adultery against the Bridegroom. —Andrew A. Bonar.

Verses 18-19. Peter, in Ac 1:20, applies this psalm to Christ when the Jews cried, "His blood be upon us and upon our children"; then did they put on the envenomed garment which has tormented them ever since. It is girded about their loins; the curse has penetrated like water, and entered the very bones like oil. How awful will be the state of those who crucify him afresh, and again put him to open shame. —Samuel Horsley.