May 6

The “Kitáb-i-‘Ahd” is, as you know, Bahá’u’lláh’s “Book of Covenant”. It is entirely written in His own handwriting. And in the light of the objections raised by some of the believers concerning the Will and Testament of ‘Abdu’l-Bahá, it is highly significant to note that this Book of Covenant of Bahá’u’lláh bears neither signature, nor seal, nor any date. It was shown to the believers, and was read in their presence nine days after Bahá’u’lláh’s ascension. The manuscript was in the possession of ‘Abdu’l-Bahá all through His ministry, and after His passing it was found enclosed in His own will. These two precious documents, namely the book of Covenant of Bahá’u’lláh and the Will and Testament of ‘Abdu’l-Bahá have both been carefully preserved and are now in the possession of the Guardian.... 

- Shoghi Effendi  (From a letter dated 25 September 1934, written on behalf of Shoghi Effendi to Dr. Mühlschlegel; ‘The Light of Divine Guidance, vol. 1)