# Not everyone who says to me, 'Lord, Lord,' will enter

"Some who say to me, 'Lord, Lord,' will not enter"

# will enter into the kingdom of heaven

Here "kingdom of heaven" refers to God's rule as king. If possible, keep "heaven" in your translation. Alternate translation: "will live with God in heaven when he shows himself to be king"

# only those who do the will of my Father who is in heaven

"only those who do what my Father in heaven wants will enter"