Sayyed ibn Tawus in his “Farhat al-Qariy” (p 102) from Yunus ibn Abu Wahb al-Qasriy:

دخلت المدينة فأتيت أبا عبد الله (عليه السلام) (فقلت: جعلت فداك اتيتك ولم أزر أمير المؤمنين (عليه السلام)) ، قال: بئس ما صنعت، لولا أنك من شيعتنا ما نظرت إليك، ألا تزور من يزوره الله مع الملائكة، ويزوره الأنبياء، ويزوره المؤمنون!.

I entered to Madina and come to Abu Abdullah (alaihi salam) and said: May I be your ransom, I came to you and didn’t visit to Commander of Faithful (alaihi salam) (1) (Imam) said: What a bad thing you did, if you wouldn’t be from our shias, we wouldn’t look at you. You didn’t visit the one, whom Allah with his angels visits, and visits prophets, and visits believers!

It was also narrated by Toose in “Tahzib al-Ahkam” (6/20)

Al-Mufid in his “al-Mazar” (p 20):

And ibn Qawlaveyh in “Kamil az-ziyarat” (p 89):

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1) Mean the grave of Ali