Midrash sur Les Nombres 10:36

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Our Rabbis were taught (Num. 10, 36) And when it rested, he said, 'Return O Lord to the myriads and thousands of Israel.' (Fol. 64) Infer from this that the Shechina does not rest upon less than two myriads and two thousands Israelites. Suppose Israel numbered twenty-two thousand less one, and there be one amongst them who did not marry, is he not the cause which prevents the Shechina from resting upon Israel? [Hence the sin of being unmarried is great]. Abba Chanin said in the name of R. Elazar: "Such a man is subject to a penalty of death, as it is said (Ib. 3, 4) And they had no children, — this allows the inference that if they had had children they would not have died." Others again say that such a person causes [directly] the Shcehina to depart from Israel, as it is said (Gen. 17, 7) To be a God unto thee, and to thy seed after thee; i.e., as long as there are seed after thee, the Shechina will rest; but if there are no seed after thee, then upon whom else shall it rest, upon the woods or the mountains?

R. Eleazar the son of Pedat declared in the name of R. Yosé the son of Zimra: Two sparks issued from between the cherubim that killed the snakes and scorpions and burned the thorns. The smoke rose up from it in a straight column, and all the nations that experienced the odor that issued forth called out: Who is this that cometh out of the wilderness like pillars of smoke? (Song 3:6). It preceded them at a distance of three days’ journey, both day and night in order to find a resting place for them, as it is said: And the ark of the Lord went before them three days’ journey, to seek out a resting place for them (Num. 10:33). Moses would say at that time: Rise up, O Lord. That is to say, Stand and wait for us, do not leave us, as it is said: And it came to pass, when the ark set forward, that Moses said: Rise up, O Lord, and let thine enemies be scattered (ibid., v. 35). And when it came to rest, he would exclaim: Return, O Lord, unto the ten thousands of the families of Israel (ibid., v. 36).