November 14

As to the religion of the Sabaeans, very little is known about the origins of this religion, though we Bahá'ís are certain of one thing, that the founder of it has been a divinely-sent Messenger. The country where Sabaeanism became widespread and flourished was Chaldea, and Abraham is considered as having been a follower of that Faith. 
(From a letter dated 10 November 1939 written on behalf of Shoghi Effendi to an individual believer; included in a Memorandum from the Research Department of the Universal House of Justice dated 6 August 1996)