Some medieval authors noted Qur’anic truths without accusing Muhammad of deception

Evidence

Sometimes, however, the presence of truth in Islam passed without comment. ‘Mixing certain true things with the false’, ‘although it contains some sound things’, ‘he mixed certain false things with the true’: these are neutral phrases. — Norman Daniel, Islam and the West, 906

Sometimes, however, the presence of truth in Islam passed without comment. ‘Mixing certain true things with the false’, ‘although it contains some sound things’, ‘he mixed certain false things with the true’: these are neutral phrases. Some authors used such, although elsewhere they stressed the intent to deceive. Vitry used the words, vera quaedam falsis interserens, and even the phrase ‘in this they agree with the Christians’, without further comment. William of Auvergne similarly remarked that ‘some other worthy things he established, and some shameful things forbade’. The reprobatio did not say that truth was inserted to deceive, only remarking baldly that Muhammad was ‘a liar, which is obvious from the words of the same, of which many were false, but some true’. Listing examples of both, the author did not maintain that the good was introduced to deceive.’ — Norman Daniel, Islam and the West, 906

Categorization

• XREF: Shows internal variety in medieval Christian polemic — a useful counterpoint to the dominant poison-in-honey trope.
• corroborated: 2 independent passages support this claim — Norman Daniel, Islam and the West, 906