from the Prophet ﷺ, "The similitude of believers in their mutual love, affection, and mercy is that of one body: when any limb of it aches, the whole body aches, because of sleeplessness and fever."
عَنِ النَّبِيِّ ﷺ أَنَّهُ قَالَ: «مَثَلُ الْمُؤْمِنِينَ فِي تَوَادِّهِمْ وَتَعَاطُفِهِمْ وَتَرَاحُمِهِمْ مَثَلُ الْجَسَدِ إِذَا اشْتَكَى مِنْهُ عُضْوٌ تَدَاعَى سَائِرُ الْجَسَدِ بِالسَّهَرِ وَالْحُمَّى۔»