Psalms 41:9

Yea, mine own familiar friend,.... Or, "the man of my peace" ; who did live peaceably with him, and ought always to have done so; whom he treated as his friend, as the rest of the apostles; calling him to that high office, and ordaining him to it, and qualifying him for it; and whom he called by the name of friend, when he came to betray him; Judas is meant;in whom I trusted; with the bag and the money in it, both for the sustenance of his own family, the apostles, and for the relief of the poor, Joh 12:6;which did eat of my bread; of his bread in common with the rest of the apostles; and who was eating with him when he gave the sign who should betray him; and who seems to have eaten of the bread in the Lord's supper: even this same personhath lifted up his heel against me; by supplanting him, dealing hypocritically with him, and betraying him into the hands of his enemies: the metaphor is either taken from an unruly horse throwing his rider, and then ungenerously spurning at him, and trampling on him; or from wrestlers, who seek to supplant and trip up each other's heels; which shows the ingratitude, baseness, and treachery of Judas; see Joh 13:18.