The Kitáb-i-Aqdas - The Most Holy Book
Index term: will and testament, under Testimony
k109.
Unto everyone hath been enjoined the writing of a will. The testator should head this document with the adornment of the Most Great Name, bear witness therein unto the oneness of God in the Dayspring of His Revelation, and make mention, as he may wish, of that which is praiseworthy, so that it may be a testimony for him in the kingdoms of Revelation and Creation and a treasure with his Lord, the Supreme Protector, the Faithful.
n137.
the Most Great Name
As explained in note 33, the Greatest Name of God can take various forms, all based on the word "Bahá". The Bahá'ís in the East have implemented this injunction of the Aqdas by heading their wills with such phrases as "O Thou Glory of the All-Glorious", "In the name of God, the All-Glorious" or "He is the All-Glorious" and the like.