Albert Barnes Commentary Psalms 119:69

"The proud have forged a lie against me: With my whole heart will I keep thy precepts." — Psalms 119:69 (ASV)

The proud - The psalmist had previously referred to the “proud” as those from whom he had suffered injury, or as having been exposed to their derision. (See the notes at Psalms 119:51). He here returns to another form in which he had suffered from them.

Have forged a lie against me - . The word translated “forged” means to patch together; it is then applied to charges or accusations against anyone, perhaps because they are made up (as they often are) of shreds and patches—hints, small matters, things having no necessary connection in themselves, but brought together as if they pertained to the same transaction. These can be words dropped here and there in conversation, which, being artfully woven together, seem to create a plausible case against a man.

Most slanders are formed and sustained in this way, for it is rare that an absolutely fabricated slander is uttered against a man, or that a charge is brought which cannot be made plausible by such circumstances as those mentioned above.

Even the most pure and circumspect cannot always avoid this, for there is something in every man’s life that a malignant and cunning enemy may take advantage of, and which he may weave into a story that some will believe, and which it may not be easy to refute. A malicious man may thus start a slander that may require years to correct, and which may even act injuriously against a man all his life.

But I will keep thy precepts with my whole heart - Despite their accusations and their attempts to turn me away from you, or to represent me as false and hypocritical. Whatever they may do; whatever reports they may start to my disadvantage, it is my fixed purpose to obey your law entirely and always. (See the notes at Psalms 119:51).