Heb. 1:14--"Are they not all ministering spirits?" Psa. 104:4--"Who
maketh his angels spirits; his ministers a flaming fire." It is
thought by some that God creates angels for a certain purpose, and
when that purpose is accomplished they pass out of existence. But
that there are many, many angels in existence all the time is clear
from the teaching of the Scriptures.
Although the angels are "spirits," they nevertheless oft-times have
appeared to men in visible, and even human form (Gen. 19; Judges
2:1; 6:11-22; Matt. 1:20; Luke 1:26; John 20:12). There seems to
be no sex among the angels, although wherever the word "angel" is
used in the Scriptures it is always in the masculine form.