Having received his early instruction from his father, who was a teacher in his native town, he attended the yeshiva of Kempen, of Myslowitz (under David Deutsch), and of Prague (under Rapoport); but, wishing to receive a regular school education, he went to Breslau, where he entered the gymnasium, and graduated in 1846.
In 1866 he was appointed Manuel Joël's successor as professor of homiletics, exegetical literature, and Midrash at the rabbinical seminary in Breslau, which position he held till his death.
An essay of Rosin's on the philosophy of Abraham ibn Ezra was edited after his death by his devoted pupil David Kaufmann and published in the "Monatsschrift" (vols.
Rosin did his literary work with an exemplary accuracy of detail and in perfect sympathy with his subject.
In his religious attitude he was strictly conservative, a true disciple of Michael Sachs (whose admirer he was); and he was at the same time broad-minded and tolerant of the opinions of others.