One of Benjamin's innovations was the adoption of many rabbinic ordinances, previously rejected by the Karaites. Unlike the rabbis, however, he left to the free choice of individual Karaites to reject or adopt these regulations. His opinion on these matters is summed up in his writing, "Sefer Dinim" (Book of Rules), in which he wrote ""As for other rules, which are observed and recorded by the Rabbanites and for which I could find no pertinent biblical verse, I have written them down also, so that you might observe them likewise if you so desire.""