The most accomplished scholar, Ali bin Isa Irbili, author of Kashful Ghummah[1] says: Sayyid Baaqi bin Atwa Alawi Husaini narrated to me: My father, Atwa was a Zaidiyyah by faith. He was unwell and the physicians had exhausted all their efforts to cure him. He was disappointed from us, his children and denied our inclination to the Imamite faith. He often said: I will not testify in your favor of your faith and I will not join your religion till your master, Mahdi (a.s.) does not come and save me from this malady.
One day, it so happened that we were sitting together at the time of Isha when we heard father shouting: Come fast!
When we went to him, he said: Your Imam Zamana (a.s.) has just left me. Hurry up so that you might be able to meet him.
We went out and looked here and there, but could not see anyone. We came back to him and asked him to tell us the whole story.
He said: A few moments ago a person came to me and said: O Atwa!
I asked: Who are you?
He replied: I am the Imam of your sons (Atwa was from the Zaidiyyah sect and his sons were Imamite). He said: I have come to cure you from this malady.
He then touched my navel and pressed it a little and then went away.
Now, when I touched and felt it, I saw that I was completely cured. Then this incident became very famous. I asked about it from other than the sons of Atwa also and they also verified it.
After the mention of this incident and the story of Ismail Harqali, the author of Kashful Ghummah says: Thus, there are many incidents of Imam Zamana (a.s.) granting miracle cure, but they are all not mentioned here for the sake of brevity.
[1] Kashful Ghummah fee Marifati Aimma, vol. 3, pp. 300-301