It is narrated from Hazrat Thawban (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: When a Muslim visits his Muslim brother who is ill, he walks among the gardens of Paradise until he returns.
Hadith Referenceمسند احمد / مسند الأنصار رضي الله عنهم / 22375
Hadith Gradingحکم دارالسلام:حديث صحيح، أبو قلابة لم يسمعه من أبى أسماء ، بينهما أبو الأشعث