This excerpt is taken from Sheikh Abu Hamza Abdul Khaliq Siddiqi's book Sahi Fazail-e-Amaal.
Religion is the name of well-wishing, and the proof of this is the Hadith of the Holy Prophet, the Master of Messengers, Muhammad Al-Arabi, peace and blessings be upon him, which Imam Muslim, may Allah have mercy on him, narrated in his Sahih from our master Tamim Dari, may Allah be pleased with him. He said: Certainly, the Holy Prophet, peace and blessings be upon him, said:
الدين النصيحة، قلنا: لمن؟ قال: لله ولكتابه ولرسوله ولأئمة المسلمين وعامتهم .
"Religion is the name of well-wishing." We asked: For whom? He said: For Allah, His Book, His Messenger, the Imams of the Muslims, and all the Muslims."
Reference: Sahih Muslim, Book of Faith, No. 196.
For the person who does well-wishing, Allah, the Lord of Glory, has promised a great reward. Allah Almighty says:
﴿لَّا خَيْرَ فِي كَثِيرٍ مِّن نَّجْوَاهُمْ إِلَّا مَنْ أَمَرَ بِصَدَقَةٍ أَوْ مَعْرُوفٍ أَوْ إِصْلَاحٍ بَيْنَ النَّاسِ ۚ وَمَن يَفْعَلْ ذَٰلِكَ ابْتِغَاءَ مَرْضَاتِ اللَّهِ فَسَوْفَ نُؤْتِيهِ أَجْرًا عَظِيمًا﴾
"There is no good in most of their secret talks, except for the one who enjoins charity or goodness or reconciliation among people, and whoever does this seeking the pleasure of Allah, We will give him a great reward."
Reference: (4-An-Nisa:114)
For those who do reform and well-wishing and those who intend to do so, Allah's forgiveness and mercy continue to surge. Allah Almighty says:
﴿إِلَّا الَّذِينَ تَابُوا مِن بَعْدِ ذَٰلِكَ وَأَصْلَحُوا فَإِنَّ اللَّهَ غَفُورٌ رَّحِيمٌ﴾
"Except for those who repent after that and reform themselves. Indeed, Allah is Forgiving and Merciful."
Reference: (24-An-Nur:5)
The believers who are reformers will have neither fear of the future nor grief of the past. Allah Almighty says:
﴿فَمَنْ آمَنَ وَأَصْلَحَ فَلَا خَوْفٌ عَلَيْهِمْ وَلَا هُمْ يَحْزَنُونَ﴾
"So those who believe and do righteous deeds will have no fear concerning them, nor will they grieve."
Reference: (6-Al-An'am:48)
One way of well-wishing is that a person should do for his Muslim brother what he likes for himself, the good thing or good deed. It is narrated from our master Anas bin Malik, may Allah be pleased with him, that the Noble Prophet, peace and blessings be upon him, said:
لا يؤمن أحدكم حتى يحب لأخيه ما يحب لنفسه .
"None of you truly believes until he loves for his brother what he loves for himself."
Reference: Sahih Bukhari, Book of Faith, Chapter: From Faith is to love for your brother..., No. 13. Sahih Muslim, Book of Faith, Chapter: The proof that among the qualities of faith is to love for your brother what you love for yourself of good, No. 170.