Psalm 141 is the 141st psalm from the Book of Psalms. It was written by David

David

David was the second king of the united Kingdom of Israel according to the Hebrew Bible and, according to the Gospels of Matthew and Luke, an ancestor of Jesus Christ through both Saint Joseph and Mary...

. It is a plea to God not only for protection from one's enemies, but also from temptation to sin.
Psalm 141 (New International Version)

Psalm 141
A psalm of David.
1 O LORD, I call to you; come quickly to me.
Hear my voice when I call to you.
2 May my prayer be set before you like incense;
may the lifting up of my hands be like the evening sacrifice.
3 Set a guard over my mouth, O LORD;
keep watch over the door of my lips.
4 Let not my heart be drawn to what is evil,
to take part in wicked deeds
with men who are evildoers;
let me not eat of their delicacies.
5 Let a righteous man strike me—it is a kindness;
let him rebuke me—it is oil on my head.
My head will not refuse it.
Yet my prayer is ever against the deeds of evildoers;
6 their rulers will be thrown down from the cliffs,
and the wicked will learn that my words were well spoken.
7 They will say, "As one plows and breaks up the earth,
so our bones have been scattered at the mouth of the grave. "
8 But my eyes are fixed on you, O Sovereign LORD;
in you I take refuge—do not give me over to death.
9 Keep me from the snares they have laid for me,
from the traps set by evildoers.
10 Let the wicked fall into their own nets,
while I pass by in safety.