Jeremiah 29:10-13

For thus saith the LORD, That after seventy years be accomplished at Babylon I will visit you, and perform my good word toward you, in causing you to return to this place. For I know the thoughts that I think toward you, saith the LORD, thoughts of peace, and not of evil, to give you an expected end. Then shall ye call upon me, and ye shall go and pray unto me, and I will hearken unto you. And ye shall seek me, and find me, when ye shall search for me with all your heart.