More from Clement of Rome
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." And again: "They bless with their mouth, but curse with their heart." 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." "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."
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Isaiah 29:13; Matthew 15:8; Mark 7:6; Psalms 12:3-5; 31:18; 112:4; 128:36, 37