There upon the bank of the stream grow all kinds of trees bearing according to their kind. By the river they shall stand, "upon the banks thereof on this side and on that side" (Ezek. 47:12). Every month they bring forth new fruit, as it is said, "It shall bring forth new fruit every month" (ibid.). Some of them are for food and others are growing, as it is said, "Because the waters thereof issue out of the sanctuary: and the fruit thereof shall be for meat, and the leaf thereof for healing" (ibid.).
Ezekiel's Breathtaking Vision of the Third Temple
Pirkei DeRabbi Eliezer 51:12