"When one of you visits the ill, then reassure him regarding his lifespan. Indeed that will not repel anything, but it will comfort his soul."
قَالَ رَسُولُ اللَّهِ ﷺ إِذَا دَخَلْتُمْ عَلَى الْمَرِيضِ فَنَفِّسُوا لَهُ فِي أَجَلِهِ فَإِنَّ ذَلِكَ لاَ يَرُدُّ شَيْئًا وَيُطَيِّبُ نَفْسَهُ
“When you enter upon one who is sick, cheer him up and give him hope of a long life, for that does not change anything (of the Divine Decree), but it will cheer the heart of the one who is sick.”
قَالَ رَسُولُ اللَّهِ ﷺ إِذَا دَخَلْتُمْ عَلَى الْمَرِيضِ فَنَفِّسُوا لَهُ فِي الأَجَلِ فَإِنَّ ذَلِكَ لاَ يَرُدُّ شَيْئًا وَهُوَ يَطِيبُ بِنَفْسِ الْمَرِيضِ
“When you enter upon one who is sick, cheer him up and give him hope of a long life, for that does not change anything (of the Divine Decree), but it will cheer the heart of the one who is sick.” (Using translation from Ibn Mājah 1438)
"إِذا دَخَلتُم على المريضِ فَنَفِّسُوا لهُ في الأجلِ فإِن ذلكَ لا يَرُد شيئًا وهو يطيب بنفس المريض".