I will extol thee - literally, “I will exalt thee;” that is, he would make God first and supreme in his thoughts and affections; he would do what he could to make Him known; he would elevate Him high in his praises.
For thou hast lifted me up - To wit, from the state of danger in which I was Psalms 30:2-3. The Hebrew word used here means properly to draw out, as from a well; and then, to deliver, to set free. As God had thus lifted him up, it was proper that he should show his gratitude by “lifting up” or extolling the name of God.
And hast not made my foes to rejoice over me - Hast not suffered them to triumph over me; that is, thou hast delivered me from them. He refers to the fact that he had been saved from a dangerous illness, and that his enemies had not been allowed to exult over his death. Compare the notes at Psalms 41:5.