Turning right at the entrance to the domed prayer chamber, one first encounters the full text of Sura 98, al- Bayyina, the Clear Proof. The message of this chapter is that clear evidence of the true scripture was not available to the People of the Book (i.e. Christians or Jews) until God sent his messenger Muhammad. The horizontal band of script at the bottom of the arch is not Quranic, but states that God’s blessings are on the (Shi’i) martyrs. Thus, Shi’i invocation echoes the Quranic verses in its stress on the truthfulness of God’s message.