Luke 4:10

for it is written [Psa. 91:11-12], 'He will put his angels in charge of you, to protect you,'

Then the devil said to Him, "If you are the Son of God, command this stone to turn into bread."

And Jesus answered him, "It is written [Deut. 6:13], 'You are supposed to worship the Lord, your God, and serve only Him.'"

And it is no wonder, for even Satan disguises himself as an angel of light [i.e., someone pure and righteous].

Are not all angels ministering spirits sent out [by God] to serve those people who will inherit salvation?

Treasury of Scripture Knowledge

For it is written, He shall give his angels charge over thee, to keep thee:

Are not all angels ministering spirits sent out [by God] to serve those people who will inherit salvation?