ChristianAnswers.Net WebBible Encyclopedia
Seven different types of gates are mentioned in the Bible…
The materials of which gates were made were…
At the gates of cities courts of justice were frequently held, and hence “judges of the gate” are spoken of (Deut. 16:18; 17:8; 21:19; 25:6, 7, etc.). At the gates prophets also frequently delivered their messages (Prov. 1:21; 8:3; Isa. 29:21; Jer. 17:19, 20; 26:10). Criminals were punished without the gates (1 Kings 21:13; Acts 7:59).
By the “gates of righteousness” we are probably to understand those of the temple (Ps. 118:19).
“The gates of hell” (Revised Version, “gates of Hades”) Matt. 16:18, are generally interpreted as meaning the power of Satan, but probably they may mean the power of death, denoting that the Church of Christ shall never die.