الْأَدَبُ الْمُفْرَدُ
Al-Adab al-Mufrad 503
Visiting the Ill
A patient is credited with the deeds that he used to do when healthy
وَعَنْ عَطَاءٍ، عَنْ أَبِي هُرَيْرَةَ قَالَ: مَا مِنْ مَرَضٍ يُصِيبُنِي أَحَبَّ إِلَيَّ مِنَ الْحُمَّى، لأَنَّهَا تَدْخُلُ فِي كُلِّ عُضْوٍ مِنِّي، وَإِنَّ اللَّهَ عَزَّ وَجَلَّ يُعْطِي كُلَّ عُضْوٍ قِسْطَهُ مِنَ الأَجْرِ.
Abu Hurayrah said that he did not like any illness more than fever because it went into each of his limbs. And, Allah grants each limb its share of reward.
Al-Adab Al-Mufrad, 503صـحـيـح (الألباني)