In the book Bahá'u'lláh admonishes Áqá Najafi ('Son of Wolf' seen in the photo to the left) and calls upon him to repent. His father Shaykh Muhammad Báqir, ('Wolf') and Mír Muḥammad Ḥusayn, the Imám Jum'ih of Isfahán, surnamed ('She-Serpent') were the conspirators against two brothers, Muhammad-Husayn Nahrí and Muhammad-Hasan Nahrí. The brothers came from an aristocratic and established mercantile family in Isfahan. The Imám-Jum'ih of the city owed the brothers money and – when the two asked for a payment – he devised a plan to rid his debt. After confronting Shaykh Muhammad-Baqir and Sultán-Mas'úd Mírzá, the son of Násiri'd-Dín Sháh of this issue, the three devised a plan to imprison the brothers on account of their Bahá’í religion. The two brothers were subsequently arrested, paraded around Isfahan with crowds jeering abuse, and publicly executed in a humiliating manner. Bahá'u'lláh wrote several tablets lamenting the loss of the two brothers, and denouncing the treachery that provoked their murder. One such tablet, Lawh-i-Burhán, addressed to Shaykh Muhammad Báqir accuses him and his accomplice Mír Muḥammad Ḥusayn of the persecution of the Bahá'ís.

Bahá’u’lláh was heartbroken by the death of the brothers – he had met the two whilst a prisoner in Adrianople. He eulogized the two, naming them the "King of Martyrs" and the "Beloved of Martyrs", and the "Twin Shining Lights".