See the notes at Matthew 7:21-27.

Lord, Lord - God judges of the heart, not by words, but by works. A good servant never disputes, speaks little, and always follows his work. Such a servant a real Christian is: such is a faithful minister, always intent either on the work of his own salvation, or that of his neighbor; speaking more to God than to men; and to these as in the presence of God. The tongue is fitly compared by one to a pump, which empties the heart, but neither fills nor cleanses it. The love of God is a hidden spring, which supplies the heart continually, and never permits it to be dry or unfruitful. Quesnel.

And why call ye me Lord, Lord,.... Or, "my Lord, my Lord", as the Syriac version renders it; acknowledging, in words, his government over them; claiming an interest in him, and making use of his name and authority:

and do not the things which I say; or "command"; and therefore such words in their mouths would be of no use to them, since they neither did his Father's will, which he taught them, nor observed his commands and ordinances which he enjoined them; and therefore should not enter into the kingdom of heaven, nor be owned by him another day, but should be bid to depart from him; See Gill on Matthew 7:21. See Gill on Matthew 7:22. See Gill on Matthew 7:23.

And why call ye me, Lord, Lord, and do not the things which I say?

6:46-49 Why call ye me, Lord, Lord? See notes on Mt 7:21-27.

6:46 And why call ye me Lord, Lord - What will fair professions avail, without a life answerable thereto? Mt 7:21.

6:37-49 All these sayings Christ often used; it was easy to apply them. We ought to be very careful when we blame others; for we need allowance ourselves. If we are of a giving and a forgiving spirit, we shall ourselves reap the benefit. Though full and exact returns are made in another world, not in this world, yet Providence does what should encourage us in doing good. Those who follow the multitude to do evil, follow in the broad way that leads to destruction. The tree is known by its fruits; may the word of Christ be so grafted in our hearts, that we may be fruitful in every good word and work. And what the mouth commonly speaks, generally agrees with what is most in the heart. Those only make sure work for their souls and eternity, and take the course that will profit in a trying time, who think, speak, and act according to the words of Christ. Those who take pains in religion, found their hope upon Christ, who is the Rock of Ages, and other foundation can no man lay. In death and judgment they are safe, being kept by the power of Christ through faith unto salvation, and they shall never perish.