ENOfficial
Abu Sa'id reported God’s messenger as saying, "When you go in to visit an invalid, express a hope that he will live long. That will not avert anything, but it will comfort him.” Tirmidhl and Ibn Majah transmitted it, and Tirmidhi said this is a gharib tradition.
Source: sunnah.com
Other translations
Arabic
وَعَنْ أَبِي سَعِيدٍ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِذَا دَخَلْتُمْ عَلَى الْمَرِيضِ فَنَفِّسُوا لَهُ فِي أَجَلِهِ فَإِنَّ ذَلِكَ لَا يَرُدُّ شَيْئًا وَيُطَيِّبُ بِنَفْسِهِ» . رَوَاهُ التِّرْمِذِيُّ وَابْنُ مَاجَهْ وَقَالَ التِّرْمِذِيُّ: هَذَا حَدِيثٌ غَرِيبٌ
sunnah.com