All thy commandments are truth. In this verse he again confirms the statement, That, in whatever ways he was afflicted, his mind had not been distracted by various devices, because, trusting in the word of God, he never doubted of his assistance. In the first place, he tells us, that the consideration, by which he was armed for repelling all assaults, was this, That the faithful, under the conduct of God, engage in a prosperous warfare, the salvation which they hope for from his word being absolutely certain. For this reason he declares, that the commandments of God are true; by which encomium he teaches us, that those who rely upon the word of God are out of all danger; and he lays down this truth, that such a support may always sustain our courage. In the second place, he complains of the treachery of his enemies, as he declared before. Here the word sqr, sheker, is repeated, by which he means, that they had no regard to equity. From this consideration also he was led to entertain the hope of deliverance; for it is the peculiar office of God to succor the poor and afflicted who are wrongfully oppressed.

All thy commandments are faithful - Margin, "faithfulness." The idea in the Hebrew is that they are worthy to be relied on. They are founded in truth, and they should secure our confidence.
They persecute me wrongfully - Hebrew, a "lie, "or "falsehood." That is, There is a "lie" or "falsehood" at the foundation of their persecutions. Those persecutions are not based on any just views of what I am, or of the treatment which I ought to receive at the hand of my fellow-men. They charge on me tilings which are not true, and they act accordingly. See the notes at Psalm 119:78.

All thy commandments [are] faithful: they persecute me wrongfully; (e) help thou me.
(e) He assures himself that God will deliver his and destroy such as unjustly persecute them.

All thy commandments are faithful,.... Or, "faithfulness" (x) they are made by a faithful God, who is holy, just, and true; they command faithfulness, sincerity, and uprightness; and require men to love their neighbours as themselves, and to do all they do faithfully, cordially, and affectionately; they are to be done in truth and faithfulness, in charity, out of a pure heart, and faith unfeigned; and therefore to dig pits for men must not be after, but contrary, to the law of God;
they persecute me wrongfully; without a cause, purely out of ill will and for religion's sake; which, as it is an argument with the saints to bear persecution patiently, it is used as an argument with the Lord, to arise and appear on the behalf of his persecuted ones, as follows:
help thou me; against my persecutors, and out of their hands: God is able to help his people; he has promised to do it; it may be expected from him; and he is a present help in time of trouble. This is a suitable petition in the mouths of God's people, and should be a prayer of faith.
(x) "fides", Tigurine version, Piscator; "veritas et fidelitas", Michaelis; so Ainsworth.

Faithful - Just and true.