This article examines a number of issues relating to discussions of the origin of language and related topics among early Arabic linguists. A number of these discussions treated the topic of the ‘revelationist’ view of language (tawqīf), and the opposing view that language had developed as a result of human convention (iṣṭilāḥ). It has been suggested that religious doctrine hampered the development of the linguistic tradition, as theologically motivated views increasingly governed the way in which linguists were able to articulate their positions on this and related subjects. We contend that the evidence does not altogether support this view, and that there was a subtle interplay between theological views and linguistic theories. Individual linguists, whom tradition identifies as having certain theological tendencies, are found to have followed lines of linguistic thinking at odds with what is assumed to have been the religious doctrine to which they subscribed. An increasingly sophisticated tradition of scholarship refined and reassessed arguments based on the Qur'an and earlier thought, with a concern for the theological implications of issues such as ishtiqāq, tarāduf and addād.