Related su Sotah 5:6

Utensils [whose manufacture] is completed in purity -- even in the Temple Courtyard -- need to be immersed [in order to be fit to use] for consecrated foods, but not for Terumah. How is this? [Consecrated] flour that was mixed, and a tevul yom (i.e., one who has immersed but remains impure until sunset) touched a small [part] of it -- the whole is disqualified. [But] with Terumah, it is not [completely] disqualified; only the part that was touched. The ground does not join either consecrated foods or Terumah; [however,] the vessel joins with what is inside it for purposes of [disqualifying] consecrated foods, but not for Terumah. Consecrated foods [are rendered impure up to] the fourth degree, but Terumah [only up to] the third degree, and with Terumah, if one of his hands is rendered impure, the other remains pure, but with consecrated foods, both must be immersed as one. One does not immerse the pure one on its own and the impure one on its own, but rather immerses both of them as one.

How did Moses know where Joseph had been buried? They said: Serakh daughter, of Asher was of the same generation, and she went and said to Moses: "In the Nile River, Joseph is buried. And the Egyptians made for him metal skewers and affixed them with wood." Moses went and stood at the Nile River and said, "Joseph, the time has come for the Holy Blessed One to redeem Israel. Behold, the Shekhina is delayed for you, and the Israelites are delayed for you, and the clouds of glory are delayed for you. If you reveal yourself, good (okay!), and if not, we are cleansed of the oath which you have sworn upon our fathers." Then the coffin of Joseph floated to the surface and Moses took hold of it and went.