The King was in his palace (high above) and the minstrel was seated on the ground. But the music emanating from his violin, which he played with his hands, was heard and appreciated in the palace. Consequently the king sent for him in his suite where even women guards were forbidden entrance. As a mark of appreciation the king ordered that a fast Arab steed with saddle studded with pearls should be awarded to the pedestrian musician. But the Sayed says, the latter refused to receive the reward saying that he wanted the royal head. (as prize)..
Note: (1) Here امين refers to the title of the Prophet.
(2) The Arab steed mentioned in the verse may imply the 'Buraq' steed brought to the Prophet by Hazrat Gibril for his journey heavenward. It may also mean the worldly benefit.
(3) The women guards may imply the angels in general and Hazrat Gibril in particular, who could not accompany the Prophet to Allah beyond a particular stage in the course of Ascention.

The king was in his colorful citadel and the bard in palace ground,
The fiddle he played was heard in the palace,
He graciously called the bard in a mansion where even maids did
not find admittance,
"Give him a horse of high breed and saddle studded with pearls,"
But, Sayyad says, the bard wouldn't accept any thing except king's head.