“Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.”
While Jesus was ministering to people, many Jews called Him, “Lord, Lord”. Some called Him “Lord”, simply as a title of respect (meaning “Sir”), such as that given to a teacher. Some other Jews used it to indicate more than just a title for a well-respected person; they meant it as a divine title (as a substitute for the Hebrew name of God, “Jehovah”). Addressing Jesus twice as “Lord, Lord” would be meant to show that their love and devotion to Him was intense!
Jesus is, therefore, talking about those who make a profession of faith in and commitment to Him. But He categorically declares that not all who call Him with great intensity are genuine worshippers who will be with Him in heaven as His eternal worshippers: “Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven”. Some of such who call Him “Lord, Lord” are His genuine worshippers – but “not everyone”.
How then can we know who would enter the kingdom of heaven? Jesus’ answer is unmistakable: “he that doeth the will of my Father which is in heaven.” In other words, true believers and worshippers of His name are obedient to the Word of God. Salvation and obedience to the will of God are inseparable because obedience is the evident fruit of one who has put genuine faith in God for salvation.