'Angels of God' in the Bible

"I tell you, everyone who confesses me before men, him will the Son of Man also confess before the angels of God;

but he who denies me in the presence of men will be denied in the presence of the angels of God.

Even so, I tell you, there is joy in the presence of the angels of God over one sinner repenting."

He said to him, "Most certainly, I tell you, hereafter you will see heaven opened, and the angels of God ascending and descending on the Son of Man."

Again, when he brings in the firstborn into the world he says, "Let all the angels of God worship him."