מדרש על יהושע 3:15

On the fifth day the waters in Egypt were changed into blood. On the fifth day our forefathers went forth from Egypt. On the same (i.e. fifth) day the waters of the Jordan stood still before the ark of the Covenant of God. On the same (i.e. fifth) day Hezekiah stopped the fountains which were in Jerusalem, as it is said, "This same Hezekiah also stopped the upper spring of the waters of Gihon" (2 Chron. 32:80).