Afterward Bahá’u’lláh was released from prison. We went to Baghdad, and Isfandiyar came there. He wanted to stay in the same home. Bahá’u’lláh, the Blessed Perfection, said to him, “When you fled away, there was a Persian minister who gave you shelter at a time when no one else could give you protection. Because he gave you shelter and protected you, you must be faithful to him. If he is satisfied to have you go, then come to us; but if he does not want you to go, do not leave him.” His master said, “I do not want to be separated from Isfandiyar. Where can I find another like him, with such sincerity, such faithfulness, such character, such power? Where can I find one? O Isfandiyar! I am not willing that you should go, yet if you wish to go, let it be according to your own will.” But because the Blessed Perfection had said, “You must be faithful,” Isfandiyar stayed with his master until he died. He was a point of light. Although his color was black, yet his character was luminous; his mind was luminous; his face was luminous. Truly, he was a point of light.
(‘Abdu’l-Bahá, Promulgation of Universal Peace, p. 427)