2 Timothy 4:2 Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine.

Romans 10:13    For whosoever shall call upon the name of the Lord shall be saved.

Romans 10:14    How then shall they call on him in whom they have not believed? and how shall they believe in him of whom they have not heard? and how shall they hear without a preacher?

Romans 10:17 So then faith cometh by hearing, and hearing by the word of God.