Comentario sobre Salmos 80:6

You have fed them bread of tears in Egypt.

and You have given them to drink tears in large measure Heb. שליש. In Babylon, where they were for seventy years, a third (שליש) of the two hundred and ten of Egypt. I learned this from the work of Rabbi Moshe Hadarshan. It may also be interpreted as regards the kingdom of Greece, which represents the third trouble. If you ask, is that [not] the fourth, because Persia and Media came before, all the seventy years of the Babylonian exile are only one exile. Menachem (p. 175) interprets שליש as the name of a drinking vessel. So he explained (Isa. 40:12): “and He measured with a ‘shalish’ the dust of the earth.” Our Sages explained it (Mid. Ps. 80: 4) as referring to the three tears that Esau shed, concerning whom it is said (Gen. 27:34): “and he cried a cry.” That is one. “A great one.” That is two. “And a bitter one.” That is three. Because of them, he merited to live by his sword, as it is said (Gen. 27:40): “and it will come to pass when you complain, etc.”