John Calvin Commentary Psalms 35:26

"Let them be put to shame and confounded together that rejoice at my hurt: Let them be clothed with shame and dishonor that magnify themselves against me." — Psalms 35:26 (ASV)

Let those who rejoice at your hurt be ashamed and confounded together. This imprecation has already been expounded; and it is only necessary to remark that there is peculiar force in the expression, together, or at once. It shows that it was not only one or two, but a great multitude, who waged war against him, and that he did not yield to the influence of fear, but believed that as soon as God would lift up his hand, he could at one stroke easily overthrow them all.

When it is said that they seek after and rejoice in David’s hurt, this shows that they were filled with cruel hatred against him. And when it is said that they magnify themselves against him, this is a sign of pride.

David, therefore, in order to render them more hateful in the sight of God, represents them as filled with pride and cruelty. And as this form of prayer was dictated by the Holy Spirit to David, there can be no doubt that the end of all the proud will be as predicted here, that they will turn back overwhelmed with shame and disgrace.