Insufficient bail: commonly Jews, who for a sum of money will bail any action whatsoever, and justify, that is, swear to their sufficiency; but, when called on, are not to be found.
Definition taken from The 1811 Dictionary of the Vulgar Tongue, originally by Francis Grose.
Jew-1 * Jew’s EyeNathan Bailey's 1736 Dictionary of canting and thieving slang
John S. Farmer's collection of canting songs and slang rhymes