'Guard' in the Bible

I said, "I will guard my ways {that I may not sin} with my tongue. I will keep a muzzle over my mouth as long as [the] wicked [are] before me."

Unless Yahweh builds a house, its builders labor at it in vain. Unless Yahweh guards a city, a guard watches in vain.

Set a guard, O Yahweh, over my mouth; keep watch over the door of my lips.