Psalm 55:13

But [it was] thou
The Targum is, "but thou Ahithophel"; of whom the words are literally to be understood, and so they are in the Talmud ^F21; and mystically and typically of Judas;

a man mine equal;
"a man", and not a beast, nor a devil; but a man, from whom humanity, kindness, and tenderness might have been expected; though both Ahithophel and Judas acted the part of a devil; and the latter is expressly called one, ( John 6:70 ) ; "mine equal"; or like unto me; as the Targum. Ahithophel was not equal to David in dignity, as the king of Israel; nor in gifts, as the sweet psalmist of Israel; nor in grace as he; but as a man, a mortal dying man: kings and subjects are of the same blood, equally liable to death, and in the grave will be manifestly on a level: or rather the sense is, that he was in his esteem and affliction as himself; he was his friend that he loved as his own soul: so Judas could not be in every sense equal to Christ who is Jehovah's fellow, and thought it no robbery to be equal with God. Indeed as a man he was like unto him; a frail, mortal man, though not sinless as Christ. The word (ykrek) may be rendered "according to my appointment" ^F23, ordination, or constitution; Judas being a man appointed and ordained to be an apostle of Christ with the rest: or, "according to my esteem" ^F24; being had in great esteem and familiarity with Christ: or, "according to my order" ^F25, rank and class; being taken into his family, admitted to his table, where be sat down and ate with him, as if he was his equal;

my guide:
or "governor" ^F26. Ahithophel was not governor over David; but was made a governor by him: he was one of his dukes or nobles, as the word is rendered in ( Genesis 36:15 ) , was raised to great dignity by him; perhaps was chief minister of state: it is certain he was his counsellor, and his counsel was with him as the oracle of God, ( 1 Chronicles 27:33 ) ( 2 Samuel 16:23 ) ; he was his guide in civil affairs; he was directed by his advice, and it may be was president of his privy council. Judas was not only the guide of them to Christ who took him, ( Acts 1:16 ) ; but when the apostles were sent out two by two before the face of Christ, to preach where he himself should come, Judas was sent also, ( Mark 6:7 ) ( Luke 10:1 ) ;

and mine acquaintance:
one well known to him, as Ahithophel was to David, and Judas to Christ, his friend and companion, in whom he confided, and who ate of his bread; and all these characters are so many aggravations of his treachery and wickedness.