Charles Ellicott Commentary Psalms 56:4

"In God (I will praise his word), In God have I put my trust, I will not be afraid; What can flesh do unto me?" — Psalms 56:4 (ASV)

In God. —This verse forms the refrain (Psalms 56:11–12 are wrongly separated). As it stands, it is hardly intelligible. The text is also rendered suspicious by the fact that the Septuagint read “my words,” instead of “his word,” and by the omission of the suffix altogether in Psalm 56:11, where the first clause of the refrain is doubled. The obvious way to understand the verse is to interpret its construction as in Psalm 44:8: “I praise God with my word.” That is, in spite of all my enemies, I find words to praise God.

I will not. —Rather, I fear not What can flesh do?