Rest in the Lord, Heb. Be silent unto, or for, or because of the Lord, i.e. do not murmur nor repine at his dealings, but silently and quietly submit to his will, and adore his judgments, and, as it follows, wait for his help. This advice and command is pressed again and again, to teach us how hard it is to learn and practise this lesson. In his way, i.e. in his evil way, as it is limited in the following words.
Related Commentaries of Psalms 37:7
Psalms 37:7
7 Rest in the LORD, and wait patiently for him: fret not thyself because of him who prospereth in his way, because of the man who bringeth wicked devices to pass.