Present Bahá'í Spiritual Assemblies are the same Houses of Justice referred to by Bahá'u'lláh

That the Spiritual Assemblies of today will be replaced in time by the Houses of Justice, and are to all intents and purposes identical and not separate bodies, is abundantly confirmed by 'Abdu'l-Bahá Himself. He has in fact in a Tablet addressed to the members of the first Chicago Spiritual Assembly, the first elected Bahá'í body instituted in the United States, referred to them as the members of the "House of Justice" for that city, and has thus with His own pen established beyond any doubt the identity of the present Bahá'í Spiritual Assemblies with the Houses of Justice referred to by Bahá'u'lláh. For reasons which are not difficult to discover, it has been found advisable to bestow upon the elected representatives of Bahá'í communities throughout the world the temporary appellation of Spiritual Assemblies, a term which, as the position and aims of the Bahá'í Faith are better understood and more fully recognized, will gradually be superseded by the permanent and more appropriate designation of House of Justice.... (Shoghi Effendi, "The World Order of Bahá'u'lláh, p. 6; The Compilation of Compilations vol II, p. 41)