Wisdom of Solomon 1:9-11
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9 For inquisition shall be made into the counsels of the ungodly: and the sound of his words shall come unto the Lord for the manifestation of his wicked deeds.
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10 For the ear of jealousy heareth all things: and the noise of murmurings is not hid.
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11 Therefore beware of murmuring, which is unprofitable; and refrain your tongue from backbiting: for there is no word so secret, that shall go for nought: and the mouth that belieth slayeth the soul.