Cp. Psalms 34:13; Psalms 39:1; Proverbs 13:3; Proverbs 21:23. The special point of the prayer is that he may be guarded from adopting the profane language of the ungodly men by whom he is surrounded. Cp. Psalms 73:8 ff. This verse is apparently quoted in Sir 22:27, "Who shall set a watch over my mouth?"

keep the door of my lips Parallelism and construction suggest the reading, a guard over the door of my lips. For the figure cp. Micah 7:5.

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