The Final Word about Wasila, Visiting graves and Fatiha

(Subhanahu Wa Ta'ala)! Accept His intercession for me.

This Hadith, with a slight change in wording, is present in Sunan Ibn Majah, Jame' Tirmidhi, Musnad Imam Ahmed, Mustadrak Al Hakim, Baihaqui, Tarikh Ul Kabir Lil Bukhari.  Imam Tirmidhi has declared this Hadith to be "Hasan-Sahih" (well-authenticated)

After the passing away of the Holy Prophet (Sallallahu alaihi wa sallam) also, the Companions would take the Wasila of the Holy Prophet (Sallallahu alaihi wa sallam).  In the caliphate of Hadhrat Umar Farooq (May Allah be well pleased with him), when people were in a famine, Hadhrat Bilal Bin Harith (May Allah be well pleased with him) went to the blessed grave of the Holy Prophet (Sallallahu alaihi wa sallam) and requested:

O Prophet of Allah (Sallallahu alaihi wa sallam)! Pray for rain for your Ummah, the Ummah is dying.  The Holy Prophet (Sallallahu alaihi wa sallam) came in his dream and said: You convey My Salaam to Umar and tell him that it will rain and tell him to be soft (on people).

This Sahabi conveyed this to Hadhrat Umar (May Allah be well pleased with him).  Hadhrat Umar (May Allah be well pleased with him) started crying and said: O Prophet of Allah (Sallallahu alaihi wa sallam), I will not make a mistake except in a matter in which I am utterly helpless.

(Sunan Baihaqui; Ibn Abi Shaiba; Wafa Ul Wafa; Injahul Hajah; Ibn Abdul Barr; Fath Ul Bari, Vol. 2, Pg No. 451)