"Talmudic literature does show that some evidence that Jewish prayers invoking angels and other intermediaries existed in the 1st century CE, and several examples of post-Talmudic prayers exist, including a familiar "piyyut" (liturgical song) entitled "Usherers of Mercy", recited before and after Rosh Hashanah in Selichot (Jewish penitential prayers).The Hebrew Bible or Tanakh is the Jewish scriptural canon and central source of Jewish law.