Expositor's Dictionary of Texts - Psalms 40:1-17
The Messianic Watchword Psalms 40:8 These words are quoted by the writer of the Epistle to the Hebrews as a Messianic prophecy; and are used at the same time to indicate the supreme element of value in the sacrifice which redeems mankind. The words were indited in some sweet thrilling springtime of the singer's history, possibly at his anointing for the kingship, or when the Lord had given him rest from his enemies; but he fell short, and generations afterwards the ideal was fulfilled by... read more
Ellicott's Commentary for English Readers - Psalms 40:9
(9) I have preached.—Literally, I have made countenances glad.Notice the rapid succession of clauses, like successive wave-beats of praise, better than any elaborate description to represent the feelings of one whose life was a thanksgiving. read more