Imam Ali [a] bought Maytham from a woman belonged to Bani Asad. The Imam asked Maytham:

What's your name?

Saalim.

The Imam said:

Allah Apostle [s] has told me that the Iranians call you Maytham.

Maytham was astonished because no one knew his real name. So, he said:

Allah and His Apostle are truthful.

Since that day, Maytham had not left the Imam.