Luke 10:1 says,
And with these things, the Lord (Jesus) appointed seventy-two [or seventy, according to some manuscripts] others, and sent them out [or sent them away: apo-stellō, from which is derived the Greek word apostolos, meaning “apostle”] in twos [ana dyo] before [or prior to: pro] his face [or his appearance: prosōpon], into every city and place where he himself was going to come [erchomai; this may have been meant to allude to what is now popularly known as “the Second Coming”].
When the seventy-two “return” (or “turn back”; more literally, “turn under” or “turn beneath”: hypo-strephō), the very first thing Jesus that says to them, in Luke 10:18, is,
I was beholding Satan falling [pesonta, a form of piptō] like lightning [astrapé] out of the heaven.
But it is important to recognize that this verse can also be translated,
I was beholding Satan falling [pesonta, a form of piptō] like (the flash of) a falling star [or shooting star, or meteor, or fallen star (or any other kind of bright flash of light in the sky): astrapé, related to the Greek word astér, meaning “star”] out of the heaven.
Presumably the author meant this to be understood in reference to the work that Jesus’s “apostles” had been doing while they were “away” (apo)—or, perhaps, in reference to the very “returning” of the apostles from their period of being “away” (or “distant,” or “off [above]”)—or, perhaps, both.