What is the prove from Quran and hadith for going to the mazaars of Awliya Allah and performing Du’a with Allah izzu jal?

There are many Ahadith which prove that to go to the graves is sunnah. A few narrations are written from Hazrat Buraidah (Radi Allahu anhu) the Prophet (Allah’s Grace & Peace be upon Him) said:

“I forbade you to go to graves and now ( I allows you ) go to visit the graves.”

Hazrat Abu Hurairah (Radi Allahu Anhu) said that the Prophet (Allah’s Grace & Peace be upon Him) visited that grave of his mother and then wept.

Hazarat Buraidah (Radi Allahu Anhu) says that the Holy Prophet (Allah’s Grace & Peace be upon Him) used to teach them when they went to graves that ” Assalam-o-Alaikum Ya Ahlad diare minal mumineen muslimmen wa inna insha Allah bikum lalahikon nasalullah lana wa lakumul aafiata ” Mishkat Shareef ( qadeemi kutub khana page 154)

What is the Quranic/hadith prove of making Awliya as a waseela for Du’a ?.

As regarding making awliya Allah as a waseela Allah Tala says, ” Those chosen bondman whom these infidels worship, they themselves excess towards that who is nearer to him in than they hope for his mercy and fear his torment ” Bani Isreal verse 57

This verse teaches that to make waseela is the act of the pious servants of Allah.

The Holy Prophet himself taught his companion to make Dua by his own waseela. Imam tirmizi narrats that:

A blind man said to the Prophet pray that Allah may grant me goodness The Prophet (peace be upon him) said if you want, I can pray for you, or you can be patient and this is better for you. He said master (peace be upon him pray for me. The Prophet (peace be upon him) ordered him to perform wudu well and recite this Dua after offering two rakats of salaah.

“O Allah I ask from you and make a mediator and draw my concentration towards you via your prophet ( peace be upon him) who is the merciful Prophet (peace be upon him ). O Rasoolallah (Peace be upon Him), I turn to my lord ( the most high) regarding this need via you so that my need be fulfilled. Lord (the most high accept His (peace be upon him) intercession for me.”

Hazarat Sayyidona uthman bin Hanif says ” I swear by God we people had not even got up, but were still talking that they very blind person reached us. His eyesight had become so clear as if he was never blind. (Tirmizi)

Imam Ibn Maja (Radi Allahju Anhu) narrates that Hazarate Abu Saeed khudri (Radi Allahu Anhu) says that the messenger of Allah almighty (peace be upon him) said:

The person who came out of his house to pray salah and he recited this ” O Allah (almighty) I ask you with the mediation of the right (Haqq) you have on questioners ( Saaileen ) and the right of me going to offer this Salah, because I have come out without pride (akar) and behaving boastfully and without showing and saying but simply for the fear of your displeasure and is search of your pleasure. I ask from you , your protection from hell and forgive my sins. And undoubtedly no one will forgive sins except you. The person who recites this, Allah (almighty) will turn to him and seventy thousand angels will ask for his repentance.

( sunan-e-ibn-e-maja page 56, published by Maktaba Islami Beirut )

These two ahadith are proof of using someone as a mediator in prayers.

Imam Ahmad bin Hambal (Radi Allahu Anhu) narrates that the prophet ( peace be upon him ) that Abdals are in Syria and they are 40 in number When one dies Allah Tala appoints another in place of it. It is because of them the rain is poured and because of them help is received over enemies and it is because of them the torment is turned away from the people of Syria. Al-Aman-wal-wa ( Shabber brothers lahore ) page 23

This hadith shareef clearly tells that the mercy and reward of Allah reach mankind with the mediation of his pious people..