And the Malach HaRevi'i sounded his shofar; and a third of the shemesh  sun  was struck and a third of the yare'ach  moon  and a third of the kokhavim, that a third of them might be darkened, and the yom could not appear, and likewise the lailah. [Shemot 10:21-23; Yechezkel 32:7]