Targum zu Bamidbar 12:16

But though Miriam the prophetess had become liable to leprosy, we have ample doctrine that by keeping the commandments and precepts a man who doeth even a little shall receive a great reward. Thus, because Miriam the prophetess had stood on the river bank for a little hour, to know what would be the end of Mosheh, the sons of Israel, being sixty myriads, and eighty legions in number, and the Cloud of Glory and the well, now moved not, nor went forward from their place, till the time that she was healed of her leprosy; but after she was healed the people journeyed from Hatseroth, and encamped in the wilderness of Pharan.