Old Testament

The Book of Leviticus: Chapter 22:26-33

 And the Lord spoke to Moses, saying: "When a bull or a sheep or a goat is born, it shall be seven days with its mother; and from the eighth day and thereafter it shall be accepted as an offering made by fire to the Lord. Whether it is a cow or ewe, do not kill both her and her young on the same day. And when you offer a sacrifice of thanksgiving to the Lord, offer it of your own free will. On the same day it shall be eaten; you shall leave none of it until morning: I am the Lord. "Therefore you shall keep My commandments, and perform them: I am the Lord. You shall not profane My holy name, but I will be hallowed among the children of Israel. I am the Lord who sanctifies you, who brought you out of the land of Egypt, to be your God: I am the Lord."

New Testament

The Epistle to the Hebrews: Chapter 1:1-14

God, who at various times and in various ways spoke in time past to the fathers by the prophets, has in these last days spoken to us by His Son, whom He has appointed heir of all things, through whom also He made the worlds; who being the brightness of His glory and the express image of His person, and upholding all things by the word of His power, when He had by Himself purged our sins, sat down at the right hand of the Majesty on high, having become so much better than the angels, as He has by inheritance obtained a more excellent name than they. For to which of the angels did He ever say:

"You are My Son, Today I have begotten You"?

And again:

"I will be to Him a Father,
And He shall be to Me a Son"?

But when He again brings the firstborn into the world, He says:

"Let all the angels of God worship Him."

And of the angels He says:

"Who makes His angels spirits
And His ministers a flame of fire."

But to the Son He says:

"Your throne, O God, is forever and ever;
A scepter of righteousness is the scepter of Your Kingdom.

You have loved righteousness and hated lawlessness;
Therefore God, Your God, has anointed You
With the oil of gladness more than Your companions."

And:

"You, Lord, in the beginning laid the foundation of the earth,
And the heavens are the work of Your hands.

They will perish, but You remain;
And they will all grow old like a garment;

Like a cloak You will fold them up,
And they will be changed.
But You are the same,
And Your years will not fail."

But to which of the angels has He ever said:

"Sit at My right hand,
Till I make Your enemies Your footstool"?

Are they not all ministering spirits sent forth to minister for those who will inherit salvation?