Theophylact of Ohrid

"Even my flesh shall rest in hope." Since Jesus, having accepted death, put off that flesh which He had assumed according to the plan of the economy, in order to raise it again from death, it is fitting that His flesh nourished itself with hope in expectation of the resurrection.

Commentary on Acts ↗

Clement of Alexandria

Again, David expressly (or rather the Lord in the person of the saint, and the same from the foundation of the world is each one who at different periods is saved, and shall be saved by faith) says, "My heart was glad, and my tongue rejoiced, and my flesh shall still rest in hope. For Thou shalt not leave my soul in hell, nor wilt Thou give Thine holy one to see corruption. …

The Stromata Book 6 ↗

Bede

For this reason my heart was delighted, and my tongue exulted. For this reason, because He, indeed, stood at the right hand, and He attests that in His thoughts, joy and exultation arose in His tongue. And indeed, as the passion was threatening, He said: "My soul is sorrowful unto death," and He began to fear and be weary (Mark 14). But He was sorrowful to show that He was truly man in soul and body, and truly passible; but His soul and tongue exulted because He knew that by His passion the human race was to be saved.

Retractions on Acts ↗