Psalm 56

In God (I will praise His word),
In the Lord (I will praise His word),
11 In God I have put my trust;
I will not be afraid.
What can man do to me? vv.10-11

Read chapter 56
The repetition of verse 4 in verse 10-11 show that this must have been the chorus of this song.  There is slight difference as we see an addition of not only God (Elohim) he will praise but also Jehovah (LORD).  This shows not that he worships two gods but that he believes and praises in the entirety of God and His word, the every aspect of God he delights in.  Trust and faith in God is where we are to be grounded and not in this world for 'what can man do to me?'  This faith banishes fear of man.
We also hear of thanksgiving this psalm brings for 'His word.'  David was a wretch and seemed to forgot to return acknowledgement of God after having obtained help.  We learn from the prescript that this was when the Philistines captured him at Gath, but God's grace saved him and as Spurgeon puts it, "He was like a dove in strangers' hands, and on his escape he records his gratitude."  When we receive such favor from the Lord the least we can do is praise Him.  His word is also God incarnate, Jesus.  "And the Word became flesh and dwelt among us, and we beheld His glory, the glory as of the only begotten of the Father, full of grace and truth" John 1:14.  So in the Word, who is Jesus, who is Jehovah, who is God let us praise!