Twelfth-century Christian polemic against Islam argued Muhammad failed the Old Testament prophetic test.

Evidence

In the Summa he lambasted Muhammad from a Christian perspective; in the Contra sectam (after a prologue in which he justifies his polemics to Christian readers) he (in book 1) enjoins his Muslim readers to listen impartially to his arguments and tries to convince them that according to the Koran they should accept Christian scripture. In book 2 he tries to prove that Muhammad is not a prophet, by contrasting his life with those of Old Testament prophets. — John V. Tolan, Saracens, 849