This excerpt is taken from Sheikh Abu Hamza Abdul Khaliq Siddiqi's book Sahih Fazail-e-Amaal.
The following verse describes the praiseworthy qualities of believing men and believing women, among which is that they love one another sincerely and cooperate with each other in religious matters. Allah Almighty has said:
﴿وَالْمُؤْمِنُونَ وَالْمُؤْمِنَاتُ بَعْضُهُمْ أَوْلِيَاءُ بَعْضٍ ۚ يَأْمُرُونَ بِالْمَعْرُوفِ وَيَنْهَوْنَ عَنِ الْمُنكَرِ وَيُقِيمُونَ الصَّلَاةَ وَيُؤْتُونَ الزَّكَاةَ وَيُطِيعُونَ اللَّهَ وَرَسُولَهُ ۚ أُولَٰئِكَ سَيَرْحَمُهُمُ اللَّهُ ۗ إِنَّ اللَّهَ عَزِيزٌ حَكِيمٌ﴾
"And the believing men and believing women are allies of one another. They enjoin what is right and forbid what is wrong, and establish prayer and give zakah and obey Allah and His Messenger. Those - Allah will have mercy upon them. Indeed, Allah is Exalted in Might and Wise."
Reference: (9-At-Tawbah:71)
Furthermore, it is the way of Muslims to cooperate with one another in good deeds and piety. Accordingly, Allah Almighty has commanded:
﴿وَتَعَاوَنُوا عَلَى الْبِرِّ وَالتَّقْوَىٰ﴾
"And cooperate in righteousness and piety."
Reference: (5-Al-Ma'idah:2)
Sayyiduna Jarir bin Abdullah Bajali (may Allah be pleased with him) said:
بايعت النبى صلى الله عليه وسلم على النصح لكل مسلم .
"I gave the pledge to the Prophet Muhammad (peace be upon him) to establish prayer, pay zakah, and to wish well for every Muslim."
Reference: Sahih Bukhari, Book of Faith, Chapter: The Religion is Sincerity, Hadith No: 200.
Supporting good and forbidding evil is obligatory upon Muslims, which leads to the creation of a healthy society.
Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) narrates that once we were traveling with the Prophet Muhammad (peace be upon him) when a man came on his mount and looked around. The Messenger of Allah (peace be upon him) said: Whoever has an extra mount should give it to the one who has none, and whoever has extra provisions for the journey should give it to the one who has none. The narrator says that the Prophet mentioned various types of wealth in this way, to the extent that we understood that none of us has any right over anything beyond his need.
Reference: Sahih Muslim, Book of Lost Property, Chapter: The Recommendation of Helping with Faith, Hadith No: 1729/18.
Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) narrates that the Messenger of Allah (peace be upon him) said: "Every good deed is charity, and your smiling at your brother and pouring water from your bucket into your brother’s vessel is also charity."
Reference: Sunan At-Tirmidhi, Chapters on Social Relations, Hadith No: 1970 -
Imam Tirmidhi (may Allah have mercy on him) classified it as "Hasan Sahih" and Al-Albani (may Allah have mercy on him) classified it as "Sahih."