ר' אדא בר' שמעון

Rabbi Ada, son of Rabbi Shimon [in the name of Rabbi Nathan, in the Midrash on Ecclesiastes, verse "Guard your foot," and this matter is discussed in the Jerusalem Talmud Berakhot, chapter 2, Mishnah 3, in the name of Rabbi Yochanan (indeed, the correct reading is Rabbi Idi). And in the Jerusalem Talmud Megillah, chapter 1, halacha 11, in the name of Rabbi Yochanan]: