Revelation 3:20
Behold, I stand at the door, and knock: if any man hears My voice, and opens the door, I will come in to him, and will eat with him, and he with Me.

Romans 10:10-13
10. For with the heart man believes unto righteousness; and with the mouth confession is made unto salvation.
11. For the scripture says, Whosoever believes on Him shall not be ashamed.
12. For there is no difference between the Jew and the Greek: for the same LORD over all is rich unto all that call upon Him.
13. For whosoever shall call upon the name of the LORD shall be saved.