The Bible does not treat anxiety as a lack of faith, but as a weight that can be handed over. The invitation keeps coming back: bring the worry to God in prayer, with thanksgiving, and live one day at a time — with the promise of a peace that does not depend on circumstances.
Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God. And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.
The best-known passage on the subject: anxiety exchanged for prayer with thanksgiving, and God’s peace guarding the heart.
But seek ye first the kingdom of God, and his righteousness; and all these things shall be added unto you. Take therefore no thought for the morrow: for the morrow shall take thought for the things of itself. Sufficient unto the day is the evil thereof.
Jesus ends his teaching on worry with an order of priorities and a limit: each day has enough trouble of its own.
Fear thou not; for I am with thee: be not dismayed; for I am thy God: I will strengthen thee; yea, I will help thee; yea, I will uphold thee with the right hand of my righteousness.
Five promises in a single verse: presence, belonging, strength, help and support.