“Abulfazl Yahyā Ibn-Salāmah” was from Shafe’ei sect and one of prominent scholars of sixth century [deceased 551 AH], who was probably the first Sunnite that expressed his believes in poem format about Imams (pbu th); specially Imam Mahdi (hgr).

Among his poets [are these verses]:

Oh you! Who ask me about the Ahl Al-Bayt’s[1] kindness

If I obviously confess it or deny it!

Impossible! But kindness of guiding imams has been composed with my blood and meat.

Ali and after him Hasan and Hussain, then Ali and his son Muhammad and Ja’afar Sādiq…(pbu th)

Then Hasan and the one who comes after him, who is “Muhammad” son of Hasan (Askari) whom is in my believe

Ibn Jowzi, I. J. “Al-Muntazam”, Vol.3, P.183

Milad, (Articles collection about Imam Mahdi (hgr)’s birth of), P.60

۱-       ۱۲ Imams and Her Holiness Zahra (pbu th)