Such a good question!  Let’s read Hebrews 1:13-14, “But to which of the angels said he at any time, Sit on my right hand, until I make thine enemies thy footstool? Are they not all ministering spirits, sent forth to minister for them who shall be heirs of salvation?” 

This portion is showing the supremacy of the Lord Jesus Christ over His created being…the angels.  Not to an angel did the Lord say to sit on His right hand.  This honor goes only to the Son of God as we read in Psalm 110:1, “The LORD said unto my Lord, Sit thou at my right hand, until I make thine enemies thy footstool.”  The image here is taken from the custom of conquerors putting their feet on the necks of those conquered.  These created angels are not equal to the Lord Jesus.  In fact, they were created to minister for those “who shall be heirs of salvation.”  So, instead of being like the Son, the angels are working altogether in implementing the Son’s commands.

Certainly, any service to the Lord is honorable.  Yet, how is it that angels are ministering spirits?  How do they minister to those who will inherit eternal life?  The saints (true believers on the Lord Jesus Christ) are heirs, not yet come into possession of the eternal glory that awaits each believer. Perhaps, the angels minister to us in opposing the evil and power of demonic spirits, in protecting and keeping our bodies, instructing and comforting our souls under the leadership and at the behest of Christ. There is not much said in the Word about HOW these angels minister to the believers, but we might consider the above as part of their ministry because it is a needed and needful work.

Elsewhere, we read of similar work of the angels.  After the Lord Jesus was tempted by the devil for forty days, we read after that temptation that, “Then the devil leaveth him, and, behold, angels came and ministered unto him.” (Matthew 4:11).

In the Garden of Gethsemane, with the Lord in great torment as He anticipated the cross before Him, we read in Luke 22:43, “And there appeared an angel unto him from heaven, strengthening him.”  Here, we might ask how an angel could possibly strengthen the Lord.  It was necessary that the fullest evidence should be given, not only of our Lord’s Divinity, but also of his humanity: The Lord’s miracles sufficiently showed His divinity.  His hunger, weariness, and agony in the garden were proofs of His humanity. Perhaps as a man, he needed the assistance of an angel to support his body, worn down by fatigue and suffering.

It would be wrong to be dogmatic in this answer, because the scriptures do not give us direct teachings about the ministry of the angels to man, and to the ministry and strengthening of the Lord.  However, we do realize the truth of their works, and thus the necessity of these works towards man and the Lord.  For that, we thank the Lord for His graciousness in providing these blessed servants.  (CC)  (652.4)