Forced converts who retained Arabic could not be instructed without Arabic-speaking clergy

Evidence

Because very few of them can speak any language except Arabic, and because there are no churchmen who know Arabic, the said converts cannot be well instructed in the matters of our faith, and there exists a great need, especially now at the outset, of churchmen who know Arabic, so as to instruct the newly converted. — L. P. Harvey, Muslims in Spain, 1500 to 1614, 201