Midrash sobre II Samuel 6:6

As soon as the last man of Israel ascended from the Jordan, the water of the Jordan returned to its place, as it is said (Josh. 4, 18) And it came to pass, when the priests that bore the ark of the covenant of the Lord came up out of the midst of the Jordan as soon as the soles of the priest's feet were drawn up unto the dry ground, that the waters of the Jordan returned unto their place, and flowed over all its banks, as aforetime. It is thus found that the ark and the priest, its bearer, was on one side of the Jordan and Israel was on the other side of the Jordan, hence the ark carried its own bearers and crossed the Jordan, as it is said (Ib., ib. 11) And it came to pass, when all the people had finished passing over the Jordan, that the ark of the Lord passed over it with the priests in the presence of the people. Concerning this it happened that Uzzah was punished, as it is said (II Sam. 6, 6) And when they came to the threshing floor of Nachon, Uzzah put forth his hand to the ark of God and took hold of it; for the oxen shook it. Thereupon the Holy One, praised be He, said unto Uzzah: "The Holy Ark carries its own bearers, how much the more could it carry itself!" Therefore (Ib., ib. 7)

(II Sam. 6, 13) And it happened that, when the bearers of the ark of the Lord had progressed six paces, he sacrificed an ox and a failing, and again it is written concerning the same (I Chr. 15, 26) That they offered seven bullocks and seven rams. How are both passages to be reconciled? Saul R. Papa b. Samuel: "On each and every pace, they slaughtered an ox and a fatling and on every six paces they sacrificed seven oxen and seven fatlings." "Whereupon R. Chisda said to him: "According to this then the entire land of Israel must have been turned into a sacrificing altars?" R. Chisda therefore said: "This means that on every six rounds of six paces they sacrificed seven bullocks and seven rams." It is written (Ib. 13, 9) The threshing floor of Kidon, and again it is written concerning the same (II Sam. 6, 6) The threshing floor of Nachon. How are both of these names to be reconciled? Said R. Jochanan: "In the beginning it was called Kidom (a spear) and finally [after it had been kept in the house of Obod Edom], it was called Nachon [preparing place, for that place prepared the ark to be taken over into the tabernacle which David constructed for it].