And they loved him with their mouth: and with their tongue they lied unto him:

“Let us cleave, therefore, to those who cultivate peace with godliness, and not to those who hypocritically profess to desire it. For [the Scripture] saith in a certain place, "This people honoureth Me with their lips, but their heart is far from Me." [Isaiah 29:13] And again: "They bless with their mouth, but curse with their heart." [Psalm 62:4] And again it saith, "They loved Him with their mouth, and lied to Him with their tongue; but their heart was not right with Him, neither were they faithful in His covenant." [Psalm 78:36-37] "Let the deceitful lips become silent," [and "let the Lord destroy all the lying lips, ] and the boastful tongue of those who have said, Let us magnify our tongue; our lips are our own; who is lord over us? For the oppression of the poor, and for the sighing of the needy, will I now arise, saith the Lord: I will place him in safety; I will deal confidently with him." [Psalm 12:3-5]”

“Lastly, here let us see the words following: "And they loved Him," he says, "in their mouth, and in their tongue they lied unto Him" [Psalm 78:36]. "But their heart was not right with Him, and they were not counted faithful in His Testament" [Psalm 78:37]. One thing on their tongue, another thing in their heart He found, unto whom the secret things of men are naked, and without any impediment He saw what they loved rather. Therefore the heart is right with God, when it does seek God for the sake of God. For one thing he desired of the Lord, the same he will require, that he may dwell always in the House of the Lord, and may meditate on the pleasantness of Him. Unto Whom says the heart of the faithful, I will be filled, not with the flesh-pots of the Egyptians, nor with melons and gourds, and garlick and onions, which a generation crooked and embittering did prefer even to bread celestial, [Exodus 16:3] nor with visible manna, and those same winged fowls; but, "I will be filled, when Your glory shall be made manifest." For this is the inheritance of the New Testament, wherein they were not counted faithful; whereof however the faith even at that time, when it was veiled, was in the elect, and now, when it has already been revealed, it is not in many that are called. "For many have been called, but few are elect." [Matthew 20:16] Of such sort therefore was the generation crooked and embittering, even when they were seeming to seek God, loving in mouth, and in tongue lying; but in heart not right with God, while they loved rather those things, for the sake of which they required the help of God.”

“For their heart was not right with him,.... Neither prepared and ready to any good work, but reprobate thereunto; nor steady, fixed, and established, as a good man's heart is, trusting in the Lord; but wavering, fickle, and inconstant; nor true, faithful, and upright; but turning aside like a deceitful bow, as is afterwards said, Psa 78:57, neither were they steadfast in his covenant; which was made with them at Sinai, though they promised to be obedient, and to do all the Lord said unto them; but this covenant they broke, though he were an husband to them; see Exo 24:7.”