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Written by Baha'u'llah in the Akka period
The recipient of this tablet, Raḍ’ar-Rúḥ, was a believer from Mashad, who was martyred around the time this tablet was written. Baha'u'llah wrote the tablet soon after he arrived in Akka, after his exile from Edirne (Adrianople). In the tablet, Baha'u'llah tells Raḍ’ar-Rúḥ that, while waiting to set sail from the port in Alexandria, he was given a letter by a messenger, which was from a Christian physician known as Faris, who was imprisoned in Alexandria with Nabil-i-Azam. In this letter, Faris declares his belief in Baha'u'llah. Baha'u'llah expresses to Raḍ’ar-Rúḥ, in the tablet, how thrilled he was to receive this moving declaration from Faris.
For a full account of the circumstances related in this tablet, see Adib Taherzadeh: The Revelation of Baha'u'llah. Akka, the Early Years, vol 3, pp8-9. Accessed here.