E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Garble (g hard)
properly means to sift out the refuse. Thus, by the statute of 1 James I. 19, a penalty is imposed on the sale of drugs not garbled. We now use the word to express a multilated extract, in which the sense of the author is perverted by what is omitted. (French, garber, to make clean; Spanish, garbillar.)
A garbled quotation may be the most effectual perversion of an authors meaning.McCosh: Divine Government, p. 14.
One of the best garbled quotations is this: David said (Psalm xiv. 1), There is no God (omitting the preceding words, The fool hath said in his heart.)