If you declare with your mouth, "Jesus is Lord," and believe in your heart that God raised him from the dead, you will be saved. (NIV)

Because if you acknowledge and confess with your lips that Jesus is Lord and in your heart believe (adhere to, trust in, and rely on the truth) that God raised Him from the dead, you will be saved. (AMP)

That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved. (KJV)