When Bahá’u’lláh departed from Baghdád, and traveled to Rumelia, the friends remained behind. The inhabitants of Baghdád then rose up against those helpless believers, sending them away as captives to Mosul. Ustád [Ismá’íl] was old and feeble, but he left on foot, with no provisions for his journey, crossed over mountains and deserts, valleys and hills, and in the end arrived at the Most Great Prison. At one time, Bahá’u’lláh had written down an ode of Rúmí’s [a famous Persian poet] for him, and had told him to turn his face toward the Báb and sing the words, set to a melody. And so, as he wandered through the long dark nights, Ustád would sing these lines:
I am lost, O Love, possessed and dazed,
Love’s fool am I, in all the earth.
They call me first among the crazed,
Though I once came first for wit and worth.
O Love, who sellest me this wine, 
O Love, for whom I burn and bleed,
Love, for whom I cry and pine—
Thou the Piper, I the reed.
If Thou wishest me to live,
Through me blow Thy holy breath.
The touch of Jesus Thou wilt give
To me, who’ve lain an age in death.
Thou, both End and Origin,
Thou without and Thou within—
From every eye Thou hidest well,
And yet in every eye dost dwell.