David
Psalm 55:13BSB·traditional attribution

But it is you, a man like myself, my companion and close friend.

C.H. Spurgeon Reformed Baptist @princeofpreachers

But it was thou. He sees him. The poetic fury is upon him, he sees the traitor as though he stood before him in flesh and blood. He singles him out, he points his finger at him, he challenges him to his face. But thou. Et tu, Brute. And thou, Ahithophel, art thou here? Judas, betrayest thou the Son of Man? A man mine equal.

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

We took sweet counsel together,.... Not in religious matters; for in these the testimonies of the Lord were David's counsellors, Psa 119:24; but in civil things: hearty counsel is one branch of friendship, and which greatly sweetens it, Pro 27:9; as this may be applied to Christ and Judas, it may denote the mutual delight and pleasure they had, the one in communicating, the other...