Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
ibnhibban:297c

[Machine] "I heard the Messenger of Allahﷺ say: 'The believers in their mutual kindness, compassion, and sympathy are just like one body. When one limb of the body suffers, the entire body responds to it with sleeplessness and fever.'"  

ابن حبّان:٢٩٧c

وَسَمِعْتُ رَسُولَ اللَّهِ ﷺ يَقُولُ «الْمُؤْمِنُونَ تَرَاحُمُهُمْ وَلُطْفُ بَعْضِهِمْ بِبَعْضٍ كَجَسَدِ رَجُلٍ وَاحِدٍ إِذَا اشْتَكَى بَعْضُ جَسَدِهِ أَلِمَ لَهُ سَائِرُ جَسَدِهِ»