“ He studied philosophy at Olmütz, and in 1772 began his theological studies at the Premonstratensian convent of Bruck, near Znaim. Having been ordained in 1775, he for a short time held a cure at Mislitz, but was soon recalled to Bruck as professor of Oriental languages and Biblical hermeneutics. On the suppression of the convent by Joseph II. in 1784, Jahn took up similar work at Olmütz, and in 1789 he was transferred to Vienna as professor of Oriental languages, biblical archaeology and dogmatics. ”

“ Besides the works already mentioned, he published Hebräische Sprachlehre für Anfänger (1792) ; Aramäische od. Chaldäische u. Syrische Sprachlehre für Anfänger (1793) ; Arabische Sprachlehre (1796) ; Elementarbuch der hebr. Sprache (1799) ”