Philip Wood, “Christian Elite Networks in the Jazīra, c. 730-850,” in
Transregional and Regional Elites. Connecting the Early Islamic Empire,
eds. H.-L. Hagemann and S. Heidemann, De Gruyter, 2020, pp. 359-383.
Chase Robinson,
Empire and Elites after the Muslim Conquest. The Transformation of Northern Mesopotamia,
Cambridge University Press, 2000, pp. 33-61
You might also look in Jack Tannous, The Making of the Medieval Middle
East: Religion, Society, and Simple Believers, which also discusses hagiographic sources which are of relevance for your question, some of them having been edited and translated just recently.
Best wishes
jonathan