David
Psalm 55:11BSB·traditional attribution

Destruction is within; oppression and deceit never leave the streets.

C.H. Spurgeon Reformed Baptist @princeofpreachers

Wickedness is in the midst thereof. The very heart of the city was base. In her places of authority crime went hand in hand with calamity. All the wilder and more wicked elements were uppermost; the canaille were commanders; the scum floated uppermost; justice was at a discount; the population was utterly demoralized; prosperity had vanished and order with it. Deceit and guile depart not from her streets.

Matthew Henry Presbyterian @wholebiblehenry

David here complains of his enemies, whose wicked plots had brought him, though not to his faith's end, yet to his wits' end, and prays against them by the spirit of prophecy. Observe here, I. The character he gives of the enemies he feared. They were of the worst sort of men, and his description of them agrees very well with Absalom and his accomplices. 1.

Commenting on Psalm 55:9-15

John Gill Reformed Baptist @doctorgill

For it was not an enemy that reproached me,.... An open and avowed one; a Moabite or a Philistine; such an one as Goliath, who cursed him by his gods; but one of his own country, city, court, and family, who pretended to be a friend; his son Absalom, according to Arama: so it was not one of the Scribes and Pharisees, the sworn enemies...