When at length they surrendered, Cordova was left in the keeping of the Jews, who had proved themselves staunch allies of the Moslems in the campaign, and who ever afterwards enjoyed great consideration at the hands of the conquerors. The Moors admitted them to their intimacy, and, until very late times, never persecuted them as the Gothic priests had done. Wherever the arms of the Saracens penetrated, there we shall always find the Jews in close pursuit: while the Arab fought, the Jew trafficked, and when the fighting was over, Jew and Moor and Persian joined in that cultivation of learning and philosophy, arts and sciences, which preeminently distinguished the rule of the Saracens in the Middle Ages.
With the cooperation of the Jews, and the terror of the Spaniards, Tārik's conquest proceeded apace.
The Moors in Spain by Stanley Lane-Poole
This is a public domain book which you can download for free from Amazon, among other places. There is no information in this extract that hasn't appeared in sources I've previously cited on the subject (see Part 1, Part 2, Part 3, Part 4). But I intend to continue piling source on source until any lingering doubt about the reality of Jewish collaboration with Muslim invaders has been expunged.