Philippians 4:6-7

Be anxious for nothing, but in everything by prayer and supplication, with thanksgiving, let your requests be made known to God; and the peace of God, which surpasses all understanding, will guard your hearts and minds through Christ Jesus.

John 14:27

Peace I leave with you, My peace I give to you; not as the world gives do I give to you.  Let not your heart be troubled, neither let it be afraid.