*Minor differences ignored. Grouped by changes, with first version listed as example.
In God have I put my trust - The sentiment in this verse is the same as in Psalm 56:6, except that the word "man" is used here instead of "flesh." The meaning, however, is the same. The idea is, that he would not be afraid of what "any man" - any human being - could do to him, if God was his friend.
In God have I put my trust,.... See Gill on Psalm 56:4;
I will not be afraid what man can do unto me; the same with flesh in Psalm 56:4, and is opposed to God, in whom he trusted; and it suggests that he was not, and would not, be afraid of the greatest of men, as well as of the meanest; See Gill on Psalm 56:4; Arama distinguishes between "flesh" and "man"; the former, he says, means the Philistines, and the latter Saul and his army.
*More commentary available at chapter level.