John Trapp on Psalms 40:3

Verſ. 3. And he hath put a new ſong in my mouth] i. e. new matter, which I ſhall ſoon contrive into a new ſong, by the help of his holy Spirit: for I cannot breath out a deſire after him, except he firſt imbreath me therewith, and ſo put a new ſong in my mouth.

Even praiſe unto our God] i.e. Unto Chriſt, ſaith Junius, to whom, and of whom the Church ſingeth, ſaith he, in the following verſes.

Many ſhall ſee it, and fear, and truſt in the Lord] Their eye ſhall affect their heart, both with fear of, and faith in the Lord, that bringeth greateſt things to paſs, and is fearful in praiſes, doing wonders, Exod. 15.