this isnt persian inscription and its probably not a “temple”.
It says the “shahada” or the declaration of faith, in Arabic, its also the main pillar in Islam, out of five pillars. It is how one becomes Muslims.
From the looks of it, this is the “mihraab” which is where the Friday Sermon is given from and also the place where the “imam” or community leader would lead the prayers, it points in the direction of Mecca, toward the Kaaba which is the direction Muslims pray five times a day and changes depending on where they are in the world. I can go on, but wonderful picture!