Once Hazrat Muhammad Sammaak رحمه الله was seriously ill, suffering considerable pain. Hazrat Ahmad Hawaari رحمه الله went to call a physician who was a Christian. On the way to the physician, he met an old sage whose face was radiant with Noor. He was dressed exquisitely and the fragrance of a wondrous perfume was emanating from him. He asked Hazrat Ahmad Hamwaari رحمه الله about his mission and when he explained that he was on his way to the Christian physician, the venerable sage commented; “Subhānallah! How can the friend of Allah Ta’ala جل جلاله seek aid from the enemy of Allah Ta’ala جل جلاله? Go back, and tell Ibn Sammaak رحمه الله to place his hand on the pain and recite:
Hazrat Ahmad Hamwaari رحمه الله returned and conveyed the message. Hazrat Muhammad Sammaak رحمه الله did as he was instructed and was immediately cured. He then asked; “Do you know who the Sage was?”
Hazrat Ahmad replied; “No.”
Hazrat Muhammad Sammaak said; “He was Khidhr عليه السلام.”
(SOURCE: THE SAADIQEEN)