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The Torah in Shemos 23:7 writes:
Keep far from talking lies
Thus we have a Torah injunction to stay away from falsehood.
The Gemara in Shabbos 104a adds:
שֶׁקֶר מְקָרְבָן מִילֵּיהּ
Falsehood is easily found
In the same way the Hebrew word for falsehood - "שֶׁקֶר" is made up of letter that balance on one point, as opposed to the word for truth - "אמת" which has letters with solid bases, falsehood is often something that is precariously balanced and often does not stay secret for long.