TSK · Zechariah 1:10

Yahweh said to Satan, "Where have you come from?" Then Satan answered Yahweh, and said, "From going back and forth in the earth, and from walking up and down in it."

Praise Yahweh, you angels of his, who are mighty in strength, who fulfill his word, obeying the voice of his word.

In the womb he took his brother by the heel; and in his manhood he contended with God.

They reported to the angel of Yahweh who stood among the myrtle trees, and said, "We have walked back and forth through the earth, and behold, all the earth is at rest and in peace."

(and behold, a talent of lead was lifted up); and this is a woman sitting in the midst of the ephah basket."

The strong went out, and sought to go that they might walk back and forth through the earth: and he said, "Go around and through the earth!" So they walked back and forth through the earth.

Aren't they all serving spirits, sent out to do service for the sake of those who will inherit salvation?