One of the Midrashey Halacha, it is the oldest commentary on Bamidbar and Dvarim. written by Rav (circa 220 c.e.) or Rabbi Shimon Bar Yochai, and often quoted in the Talmud.
This printing of Sifri includes commentary by Rabbi Naftali Tzvi Yehudah Berlin (Ha-Netziv) [1817-1893], Rosh Yeshiva of the famed Volozhin Yeshiva. [Torah Commentary]