The Kitáb-i-Aqdas - The Most Holy Book
Index term: Consultation
k30.
The Lord hath ordained that in every city a House of Justice be established wherein shall gather counsellors to the number of Bahá, and should it exceed this number it doth not matter. They should consider themselves as entering the Court of the presence of God, the Exalted, the Most High, and as beholding Him Who is the Unseen. It behoveth them to be the trusted ones of the Merciful among men and to regard themselves as the guardians appointed of God for all that dwell on earth. It is incumbent upon them to take counsel together and to have regard for the interests of the servants of God, for His sake, even as they regard their own interests, and to choose that which is meet and seemly. Thus hath the Lord your God commanded you. Beware lest ye put away that which is clearly revealed in His Tablet. Fear God, O ye that perceive.
n52.
take counsel together
Bahá'u'lláh has established consultation as one of the fundamental principles of His Faith and has exhorted the believers to "take counsel together in all matters". He describes consultation as "the lamp of guidance which leadeth the way" and as "the bestower of understanding". Shoghi Effendi states that the "principle of consultation . . . constitutes one of the basic laws" of the Bahá'í Administrative Order.
In Questions and Answers, number 99, Bahá'u'lláh outlines an approach to consultation and stresses the importance of achieving unanimity in decision-making, failing which the majority decision must prevail. The Universal House of Justice has clarified that this guidance concerning consultation was revealed before Spiritual Assemblies had been established and was in answer to a question about the Bahá'í teachings on consultation. The House of Justice affirms that the emergence of Spiritual Assemblies, to which the friends may always turn for assistance, in no way prohibits them from following the procedure outlined in Questions and Answers. This approach may be used by the friends, should they wish, when they desire to consult on their personal problems.
n82.
Verily, it is enjoined upon you to offer a feast, once in every month
This injunction has become the basis for the holding of monthly Bahá'í festivities and as such constitutes the ordination of the Nineteen Day Feast. In the Arabic Bayán the Báb called upon His followers to gather together once every nineteen days to show hospitality and fellowship. Bahá'u'lláh here confirms this and notes the unifying role of such occasions.
'Abdu'l-Bahá and Shoghi Effendi after Him have gradually unfolded the institutional significance of this injunction. 'Abdu'l-Bahá emphasized the importance of the spiritual and devotional character of these gatherings. Shoghi Effendi, besides further elaborating the devotional and social aspects of the Feast, has developed the administrative element of such gatherings and, in systematically instituting the Feast, has provided for a period of consultation on the affairs of the Bahá'í community, including the sharing of news and messages.
In answer to a question as to whether this injunction is obligatory, Bahá'u'lláh stated it was not (Q&A 48). Shoghi Effendi in a letter written on his behalf further comments:

Attendance at Nineteen Day Feasts is not obligatory but very important, and every believer should consider it a duty and privilege to be present on such occasions.
q99.
 
Question: Concerning consultation.
Answer: If consultation among the first group of people assembled endeth in disagreement, new people should be added, after which persons to the number of the Greatest Name, or fewer or more, shall be chosen by lot. Whereupon the consultation shall be renewed, and the outcome, whatever it is, shall be obeyed. If, however, there is still disagreement, the same procedure should be repeated once more, and the decision of the majority shall prevail. He, verily, guideth whomsoever He pleaseth to the right way.