1. Whenever the opportunity arises to visit a Muslim who has fallen ill, do so even though the sick may not be from among one’s family or friends.
عَن أَنَسِ بْنِ مَالِكٍ رَضِيَ اللهُ عَنهُ قَالَ قَالَ رَسُولُ اللهِ صَلَى اللهُ عَلَيهِ وَسَلَّمَ مَنْ تَوَضَّأَ فَأَحْسَنَ الْوُضُوءَ وَعَادَ أَخَاهُ الْمُسْلِمَ مُحْتَسِبًا بُوْعِدَ مِنْ جَهَنَّمَ مَسِيرَةَ سَبْعِينَ خَرِيفًا. (أبو داود ص441)
Hadhrat Anas (Radhiallahu Anhu) reports that Rasulullah (Sallallahu Alaihi Wasallam) said: “The one who makes a perfect wudhu (i.e. through fulfilling all the sunan and mustahabbaat of wudhu) and sets out to visit his sick Muslim brother with the hope of receiving the rewards for visiting the sick, such a person will be saved from Jahannum the distance of seventy years.
2. When visiting the sick one should recite the following duaa:
لاَ بَأسَ طَهُورٌ إنْ شَاءَ اللهُ
There is no need to worry, Insha Allah through this sickness you will be cleansed and purified. (i.e. There is absolutely no need for you to worry or fear. You are just going through a cleansing process. Spiritually you are been cleansed from your sins and physically your body is being rid of the toxins and the harmful effects. Hence, when this sickness has come to you as a mercy in disguise from the side of Allah Ta’ala, there is no need for you to worry and grieve).
One may also recite the following duaa seven times:
أَسْألُ اللهَ الْعَظِيمَ ، رَبَّ العَرشِ العَظِيمِ ، أَن يَّشْفِيَكَ
I beseech Allah Ta’ala, the Almighty, the Lord of the great throne, to cure you.
عن ابن عباس رضي الله عنهما أن النَبِيَّ صَلَّى اللهُ عَلَيهِ وَسَلَّمَ دَخَلَ عَلَى أعْرَابِيٍّ يَعُودُه ، وَكَانَ إذَا دَخَلَ عَلَى مَن يَعُودُهُ ، قَالَ لاَ بَأسَ طَهُورٌ إنْ شَاءَ اللهُ (البخاري 2/845)
Hadhrat Ibn Abbaas (Radhiallahu Anhuma) reports that once Rasulullah (Sallallahu Alaihi Wasallam) visited a sick villager, and whenever he would visit the sick he used to recite the following duaa:
لاَ بَأسَ طَهُورٌ إنْ شَاءَ اللهُ
Do not grieve (do not worry), Insha Allah through this sickness you will obtain purity (from your sins)
عن ابن عباس رضي الله عنهما عن النبي صلى الله عليه وسلم قال: مَن عَادَ مَرِيضًا لَم يَحْضُرْهُ أَجَلُه ، فَقَال عِنْدَه سَبْعَ مِرَارٍ أَسْألُ اللهَ الْعَظِيمَ ، رَبَّ العَرشِ العَظِيمِ ، أَن يَّشْفِيَكَ، إلَّا عَافَاه اللهُ مِن ذَلِكَ الْمَرَضِ. (أبو داود ص442)
Hadhrat Ibn Abbaas (Radhiallahu Anhuma) reports that Rasulullah (Sallallahu Alaihi Wasallam) said, “Whoever recites the following duaa seven times upon a sick person -who is not destined to die in that sickness-, Allah Ta’ala will cure him from that sickness:
أَسْألُ اللهَ الْعَظِيمَ ، رَبَّ العَرشِ العَظِيمِ ، أَن يَّشْفِيَكَ
I beseech Allah Ta’ala, the Almighty, the Lord of the great throne, to cure you.