Since it would appear that the Sifrei both to Numbers and to Deuteronomy in their present form were unknown to either the Jerusalem or the Babylonian Talmuds, it is probable that they were arranged and edited in Erez Israel, but not before the end of the fourth century C.E. The Sifrei to Numbers was first printed together with the Sifrei to Deuteronomy in Venice in 1545, and has been frequently reprinted. It was the fact of their being printed together, in addition to the common name, which caused them to be regarded as one Midrash, but they belong to different tannaitic schools and are therefore treated separately. Like the Sifra, the Sifrei is written in pure mishnaic Hebrew with an admixture of Greek words.
הסכמות: ר' פינחס הלוי איש הורויץ, פ"פ דמיין, יב אדר תקמ"ט;
ר' צבי הירש מזאמושט, גלוגא רבתי, ד אדר תקמ"ט;
ר' שלמה מרדכי איש ימיני, המבורג, יא ניסן תקמ"ט.