Psalm 27 is one of my favorite Psalms on overcoming fear. If you struggle with fear or are in a difficult season that requires all the strength you have, I highly recommend taking the time to memorize this Psalm. I did so years ago, and God still brings it to my mind at seemingly random times. It never fails to uplift and strengthen me in difficult times.
The Lord is my light and my salvation; whom shall I fear? The Lord is the strength of my life; of whom shall I be afraid.
When the wicked came against me to eat up my flesh, my enemies and foes, they stumbled and fell.
Though an army may encamp against me, my heart shall not fear; though war may rise against me, in this I will be confident.
One thing I have desired of the Lord, that will I seek: that I may dwell in the house of the Lord all the days of my life, to behold the beauty of the Lord, and to inquire in His temple.
For in the time of trouble He shall hide me in HIs pavilion; in the secret place of His tabernacle He shall hide me; He shall set me high upon a rock.
And now my head shall be lifted up above my enemies all around me; therefore I will offer sacrifices of joy in His tabernacle; I will sing, yes, I will sing praises to the Lord.
Hear, O Lord, when I cry with my voice! Have mercy also upon me, and answer me.
When You said, “Seek My face,” my heart said to You, “Your face, Lord, I will seek.”
Do not hide Your face from me; do not turn Your servant away in anger; You have been my help; do not leave me nor forsake me, O God of my salvation.
When my father and my mother forsake me, then the Lord will take care of me.
Teach me Your way, O Lord, and lead me in a smooth path, because of my enemies.
Do not deliver me to the will of my adversaries; for false witnesses have risen against me, and such as breathe out violence.
I would have lost heart, unless I had believed that I would see the goodness of the Lord in the land of the living.
Wait on the Lord; be of good courage, and He shall strengthen your heart; wait, I say, on the Lord!