“Set a guard over my mouth!
Keep watch over the door of my lips!
Do not turn my heart to any evil!
Do not let me busy myself
With wicked deeds
With those who work iniquity!
Do not let me eat of their delicacies!”
David wanted Yahweh to guard his mouth and his lips so that he would not speak evil. He wanted Yahweh to keep his heart from evil. David did not want to busy himself with wicked deeds among those who were iniquitous. He did not want to eat of the delicacies of iniquity.