On the authority of Abu Hamzah Anas bin Malik (may Allah be pleased with him) - the servant of the Messenger of Allah (peace and blessings of Allah be upon him) - that the Prophet (peace and blessings of Allah be upon him) said :
"None of you will believe until you love for your brother what you love for yourself."
Related by Bukhari & Muslim
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Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “You will not enter Paradise until you believe and you will not believe until you love each other. Shall I show you something that, if you did, you would love each other? Spread peace between yourselves.”
Source: Ṣaḥīḥ Muslim 54
Grade: Sahih (authentic) according to Muslim
عَنْ أَبِي هُرَيْرَةَ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ لَا تَدْخُلُونَ الْجَنَّةَ حَتَّى تُؤْمِنُوا وَلَا تُؤْمِنُوا حَتَّى تَحَابُّوا أَوَلَا أَدُلُّكُمْ عَلَى شَيْءٍ إِذَا فَعَلْتُمُوهُ تَحَابَبْتُمْ أَفْشُوا السَّلَامَ بَيْنَكُمْ
54 صحيح مسلم كتاب الإيمان باب بيان أنه لا يدخل الجنة إلا المؤمنون وأن محبة المؤمنين من الإيمان وأن إفشاء السلام سببا لحصولها
http://dailyhadith.abuaminaelias.com/2012/03/16/hadith-on-love-you-will-not-enter-paradise-until-you-love-each-other-for-the-sake-of-allah/
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Anas ibn Malik reported: The Prophet, peace and blessings be upon him, said, “None of you will have faith until he loves for his brother what he loves for himself.”
Source: Ṣaḥīḥ al-Bukhārī 13, Ṣaḥīḥ Muslim 45
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
http://dailyhadith.abuaminaelias.com/2011/03/18/love-for-all-people-what-you-love-for-yourself/
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Hadiths about brotherhood
Abu Musa reported: The Messenger of Allah, peace and blessings be upon him, said, “Verily, the believers are like a structure, each one strengthening the other,” and the Prophet clasped his fingers together.
Source: Ṣaḥīḥ al-Bukhārī 467, Ṣaḥīḥ Muslim 2585
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
عَنْ أَبِي مُوسَى عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِنَّ الْمُؤْمِنَ لِلْمُؤْمِنِ كَالْبُنْيَانِ يَشُدُّ بَعْضُهُ بَعْضًا وَشَبَّكَ أَصَابِعَهُ
467 صحيح البخاري كتاب الصلاة أبواب استقبال القبلة باب تشبيك الأصابع في المسجد وغيره
2585 صحيح مسلم كتاب البر والصلة والآداب باب تراحم المؤمنين وتعاطفهم وتعاضدهم
An-Nu’man ibn Basheer reported: The Messenger of Allah, peace and blessings be upon him, said, “The parable of the believers in their affection, mercy, and compassion for each other is that of a body. When any limb aches, the whole body reacts with sleeplessness and fever.”
Source: Ṣaḥīḥ al-Bukhārī 5665, Ṣaḥīḥ Muslim 2586
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
عَنْ النُّعْمَانِ بْنِ بَشِيرٍ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَثَلُ الْمُؤْمِنِينَ فِي تَوَادِّهِمْ وَتَرَاحُمِهِمْ وَتَعَاطُفِهِمْ مَثَلُ الْجَسَدِ إِذَا اشْتَكَى مِنْهُ عُضْوٌ تَدَاعَى لَهُ سَائِرُ الْجَسَدِ بِالسَّهَرِ وَالْحُمَّى
5665 صحيح البخاري كتاب الأدب باب رحمة الناس والبهائم
2586 صحيح مسلم كتاب البر والصلة والآداب باب تراحم المؤمنين وتعاطفهم وتعاضدهم
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Quranic verses about brotherhood and hadiths about loving one another (article)
http://abuaminaelias.com/brotherhood-in-the-quran-and-sunnah/
