John Gills Exposition of the Bible Commentary - Psalms 139:3
Thou compassest my path and my lying down ,.... The Targum adds, "to study in the law.' His walk in the daytime, and every step he took, and his lying down at night. It denotes his perfect knowledge of all his actions, day and night; he surrounds every path of man, that they cannot escape his knowledge. Or, "thou winnowest", as some render the word F3 זרית "ventilasti", Pagninus, Montanus; so Tigurine version and Ainsworth. ; he distinguishes actions; he discerns and separates... read more
Matthew Henry's Complete Commentary - Psalms 139:1-6
David here lays down this great doctrine, That the God with whom we have to do has a perfect knowledge of us, and that all the motions and actions both of our inward and of our outward man are naked and open before him. I. He lays down this doctrine in the way of an address to God; he says it to him, acknowledging it to him, and giving him the glory of it. Divine truths look fully as well when they are prayed over as when they are preached over, and much better than when they are disputed... read more