«وَإِنِّي لَأُخَالُ بَعْلَكِ صَدُوقًا فِي الْكَلَامِ بَرِيئًا مِنَ الْمَلَامِ»
I am inclined to think that your husband speaks truthfully and deserves no blame.
Innī and the lām of la-ukhālu add emphasis, but ukhalu remains a verb expressing supposition. Baʿlaki is its first object and ṣadūqan its second, with barīʾan expanding the characterization.
Emphasis strengthens the speaker’s stated judgement; it does not remove the uncertainty inherent in “I suppose.” That distinction prevents the judge’s inclination from being misrepresented as verified proof.