Majma al-Zawaid 3762 — Visiting the sick

Ali bin Umar bin Ali narrates from his father, from his grandfather, as a marfu' hadith, that he (peace and blessings be upon him) said: "The visit to the sick that is greatest in reward is the one that is shortest, and condolence is offered once."
Al-Bazzar recorded it. He said: I think that the narrator Ibn Abi Fudayk did not hear from Ali.