The Angels that die and are re-created daily versus the Angels that live:[1]
We read in the daily prayer of the blessings of the Shema “Yotzer Misharsim.” This refers to the hundreds of thousands of angels created each day. These angels do not last more than a day, as they expire as a result of the great and burning passion for G-d. They are then re-created, and hence they go through a cycle of creation, death, and recreation on a daily basis. We also read in the daily prayer “Viasher Misharsav.” This refers to the hundreds of thousands of Angels per battalion that were created from the beginning of time who do not expire as a result of their comprehension and love of G-d, and remain in existence each day.
[1] Likkutei Torah p. 34b