wolf in sheep's clothing
Someone who or something which is harmful or threatening but disguised as something peaceful or pleasant.
“He ſaith, He doth not plead for all who go under the name of Miniſters in England; he fears there is many of them no better than Wolves in Sheep's Clothing, &c. Then why doth he not come out, and cry againſt them, but remain amongſt them in their Practice? For wherein can he clear himſelf of any one thing, which they are guilty of, which he confeſſes are Wolves in Sheep's Clothing? [...] I have as much ground to ſuſpect him to be one of the Wolves in Sheep's Clothing, as he has ground to ſuſpect his own Companions and Generation to be ſuch.”
“If the wolf was to be feared, the learned gentleman might rest assured it would be the wolf in sheep's clothing, the masked pretender to patriotism. It was not from the fang of the lion, but from the tooth of the serpent, that reptile that insidiously steals upon the vitals of the constitution and gnaws it to the heart ere the mischief is suspected, that destruction was to be feared.”
“The military power ſhould ever be kept diſtinct. We then ſee it, we know it by its proper name, we are on our guard, but when a power of a ſimilar kind intrudes itſelf upon us, under the name of a civil power, the wolf in ſheep's clothing deceives and endangers us.”
Thesaurus
From Matthew 7:15 in the Bible (King James Version; spelling modernized): “Beware of false prophets which come to you in sheep’s clothing, but inwardly they are ravening wolves.”
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