Leila, Book IV by Edward Bulwer-lytton

The Israelites did not limit their struggles to the dark conspiracy to which allusion has been made. In some of the Moorish towns that revolted from Ferdinand, they renounced the neutrality they had hitherto maintained between Christian and Moslem. Whether it was that they were inflamed by the fearful and wholesale barbarities enforced by Ferdinand and the Inquisition against their tribe, or whether they were stirred up by one of their own order, in whom was recognised the head of their most sacred family; or whether, as is most probable, both causes combined -- certain it is, that they manifested a feeling that was thoroughly unknown to the ordinary habits and policy of that peaceable people. They bore great treasure to the public stock -- they demanded arms, and, under their own leaders, were admitted, though with much jealousy and precaution, into the troops of the arrogant and disdainful Moslems.

In this conjunction of hostile planets, Ferdinand had recourse to his favourite policy of wile and stratagem. Turning against the Jews the very treaty Almamen had once sought to obtain in their favour, he caused it to be circulated, privately, that the Jews, anxious to purchase their peace with him, had promised to betray the Moorish towns, and Granada itself into his hands. The paper, which Ferdinand himself had signed in his interview with Almamen, and of which, on the capture of the Hebrew, he had taken care to repossess himself, he gave to a spy whom he sent, disguised as a Jew, into one of the revolted cities.