 The Sifre taught that Moses told the people that if a candidate were wrapped in a cloak and took a seat before Moses, he might not know from which tribe the candidate came (or whether he was fit for the job).But the people would know him, for they grew up with him.Rav Hisda taught that at first, officers were appointed only from the Levites, for says, "And the officers of the Levites before you," but in Rav Hisda's time, officers were appointed only from the Israelites, for it was said (paraphrasing ), "And officers over you shall come from the majority" (that is, the Israelites).