The Two Shahs before Azargashasp

From C4.40, Kay Khosrow Returns to His Grandfather. It illustrates C4.40.51–58:

C4.40.51
They mounted, swift as wind, and rode away,To Azargashasp’s shrine without delay.
C4.40.52
They journeyed in their robes of spotless white,With fear and hope within their hearts alight.
C4.40.53
When they beheld the Fire, they wept and cameTo scatter precious jewels upon the flame.
C4.40.54
The two Shahs stayed there, weeping in their pain,And cried for help with tears that fell like rain.
C4.40.55
They called upon the Maker, praised Him long,And showered gems upon the priestly throng.
C4.40.56
Shah Khosrow washed his face with tears that flowed;On Zand-Avesta, dinars he bestowed.
C4.40.57
A week they stayed before their God and prayed;Do not suppose to fire their worship strayed.
C4.40.58
The Fire was then their prayer’s appointed place;The worshipper had tears upon his face.