The meaning of Congregation in the Bible
(From Easton's Bible Dictionary)

(Heb. kahal), the Hebrew people collectively as a holy community (Numbers 15:15). Every circumcised Hebrew from twenty years old and upward was a member of the congregation. Strangers resident in the land, if circumcised, were, with certain exceptions (Exodus 12:19; Numbers 9:14; Deuteronomy 23:1-3), admitted to the privileges of citizenship, and spoken of as members of the congregation (Exodus 12:19; Numbers 9:14; 15:15). The congregation were summonded together by the sound of two silver trumpets, and they met at the door of the tabernacle (Numbers 10:3). These assemblies were convened for the purpose of engaging in solemn religious services (Exodus 12:27; Numbers 25:6; Joel 2:15), or of receiving new commandments (Exodus 19:7,8). The elders, who were summonded by the sound of one trumpet (Numbers 10:4), represented on various occasions the whole congregation (Exodus 3:16; 12:21; 17:5; 24:1).

See more on the meaning of Congregation in the Bible:
Congregation {International Standard Bible Encyclopedia}

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