... were in Old Testament times, those Israelites who were responsible for carrying out the work of God. In the New Testament, they were the appointed elders of the Christian churches, who were responsible for God's work; as in the two following examples, firstly where Paul is instructing Timothy about church discipline, and secondly, where Jesus Christ after his resurrection, is giving messages to those in charge of the churches of Asia:

"I charge you, in the sight of God and Christ Jesus and the elect angels, to keep these instructions without partiality." (1 Timothy 5:21).

"To the angel of the Church in Ephesus write…." (Revelation 2:1).

Abraham
Acts of the Apostles
Adam
Adoption
Affliction
Age, Aion
Almighty God
Altar
Amen
Angel
  1. Human angels
  2. "The angels who sinned"
  3. Immortal angels
  4. "Fallen angels"
  5. "Evil angels"
Anger
Anointing
Antichrist
Apocrypha
Apostasy
Apostle
Archangel
Ark
  1. Ark constructed by Noah
  2. Ark of the Covenant
Armageddon
Ascension
Assyria
Astrology
Atonement