Psalm 141:3 in the World English Bible
Set a watch, LORD, before my mouth. Keep the door of my lips.
Context
2 Let my prayer be set forth before thee as incense; and the lifting up of my hands as the evening sacrifice.
3 Set a watch, O LORD, before my mouth; keep the door of my lips.
4 Incline not my heart to any evil thing, to practise wicked works with men that work iniquity: and let me not eat of their dainties.