"The Lord spoke also to men through the agency of angels.
These holy beings are not, as some suppose, the spirits of dead men, but are beings of a higher order than men, as man was made “a little lower than the angels.” Hebrews 2:7. 
In those ancient times Satan transformed himself into an angel of light, sought to lead men into a false worship of their dead friends and heroes, and represented himself and angels as being the spirits of their dead.
The Lord plainly said of such worship and transactions that what was professedly offered to the dead was in reality sacrificed to devils - fallen angels. See Deut.32:17; Ps.106:28, 35; 1Cor.10:20.
*The pure, holy angels are “sent forth to minister for them who shall be heirs of salvation” (Heb.1:7,14); but they never come to represent dead persons.
Through the instrumentality of angels the Lord has often
communicated His will to men.
In this manner He spoke to Abraham (Gen.18:1-3); to Lot (Gen.19:1); to Joshua (Joshua 5:13-15); to Gideon (Judges 6:11-22); and to Manoah (Judges 13)."
J.N. Loughborough