Is it possible that angels are "holy spirits" in themselves and are sent by THE Holy Spirit to the heirs of salvation for to minister?
Heb 1:13 But to which of the angels said he at any time, Sit on my right hand, until I make thine enemies thy footstool?
Heb 1:14 Are they not all ministering spirits, sent forth to minister for them who shall be heirs of salvation?
Do we see this at Pentecost
Heb 1:7 And of the angels he saith, Who maketh his angels spirits, and his ministers a flame of fire.
Ac 2:3 And there appeared unto them cloven tongues like as of fire, and it sat upon each of them.
Ac 2:4 And they were all filled with the Holy Ghost, and began to speak with other tongues, as the Spirit gave them utterance.