David
Psalm 56:4BSB·traditional attribution

In God, whose word I praise—in God I trust. I will not be afraid. What can man do to me?

John Calvin Reformed @genevareformer

PSALM 56 In this psalm David mixes complaint with prayer, and assuages the distress of his mind by meditation upon the mercy of God. He pray, that he may experience the divine help under the persecutions to which he was subjected by Saul, and his other enemies; and expresses his confidence of success.

Commenting on Psalm 56:1-13

C.H. Spurgeon Reformed Baptist @princeofpreachers

In God I will praise his word. Faith brings forth praise. He who can trust will soon sing. God's promise, when fulfilled, is a noble subject for praise, and even before fulfilment it should be the theme of song. It is in or through God that we are able to praise. We praise as well as pray in the Spirit.

Matthew Henry Presbyterian @wholebiblehenry

David, in this psalm, by his faith throws himself into the hands of God, even when he had by his fear and folly thrown himself into the hands of the Philistines; it was when they took him in Gath, whither he fled for fear of Saul, forgetting the quarrel they had with him for killing Goliath; but they soon put him in mid of it, Sa1 21:10, Sa1 21:11.

Commenting on Psalm 56:1-7