That if you confess with your mouth the Lord Jesus and believe in your heart that God has raised Him from the dead, you will be
saved. For with the heart one believes unto righteousness, and with the mouth confession is made unto salvation.
Romans 10:9,10 (NKJV)
For by grace you have been saved through faith and that not of yourselves, it is the gift of God, not of works lest anyone
should boast.
Ephesians 2:8,9 (NKJV)