R. Eliezer says: Yithro heard the splitting of the sea and came (to join Israel). For the splitting of the sea was heard from one end of the world to the other, viz. (Joshua 5:1) "And it was, when all the kings of the Emori heard, etc." And thus did Rachav the harlot say to the messengers of Joshua (Ibid. 2:10-11) "For we heard how the L–rd dried up the waters of the Red Sea before you when you went out of Egypt … and when we heard, our hearts melted, and no spirit was left in a man before you."