Rituals termed in Sumerian NAM.BÚR.BI (Akk namburbû), meaning "its undoing," could be performed by priests, or even by Gods, to ward off the evil portended by an omen. The Gods Ea, Šamaš and Marduk (also known as Asalluhi) are said to "perform apotropaic rituals wherever there are portentous happenings and signs," and an epithet of the Sun-God identifies Him as "the one who averts the [bad] signs and portents by means of namburbi rituals." The seventh-century reports from the astrologers to the Kings Esarhaddon and Aššurnaṣipal reveals the use of such rituals, as in the following selected lines: "Let them perform a namburbû ritual; the halo was not a closed one." "This is a bad sign for all lands. Let the king my lord perform a namburbû ritual and so make its evil pass by." "Mars remained four fingers distant from Saturn, it did not come close. It did not reach it. I have copied [the omen from "Enūma Anu Enlil."] What is the harm in it? Let the pertinent namburbû ritual be performed." The protection of the king was paramount, since the celestial omens (especially the lunar) most directly affected him as the representative of the state. Therefore the scholar Munnabitu warned that "the [k]ing must not become negligent about these observations of the [mo]on; let the king perform either a namburbû or [so]me ritual which is pertinent to it."
Heaven and Earth: Divine-Human Relations in Mesopotamian Celestial Divination by Francesca Rochberg in “Magic in History: Prayer, Magic, and the Stars in the Ancient and Late Antique World” edited by Scott Noegel, Joel Walker, and Brannon Wheeler (p 182-3)














