A.T. Robertson Commentary Luke 14:17

"and he sent forth his servant at supper time to say to them that were bidden, Come; for [all] things are now ready." — Luke 14:17 (ASV)

His servant (τον δουλον αυτου). His bondservant. Vocator or Summoner (Esther 5:8; Esther 6:14). This second summons was the custom then as now with wealthy Arabs. Tristram (Eastern Customs, p. 82) says: "To refuse the second summons would be an insult, which is equivalent among the Arab tribes to a declaration of war."