PROOF OF BID'AH HASANA

Allah Ta'ala says in the Holy Qur'an:

"And we ordained in the hearts of those who followed him Compassion and Mercy. But the Monasticism which they innovated for themselves which we did not prescribe for them"

Surah Al Hadeed, verse 27"

This verse points out that when something new is invented to please Allah Ta'ala then it is permissible, and Allah Ta'ala gives reward for it. Those who do not fulfil the requirements then Allah Ta'ala will not reward them.

RasoolAllah [May Allah bless Him and grant Him peace] stated: "The person who introduced a good thing in Islam, shall obtain the reward for it and also the reward for those who adopt it. As for the one who introduces a bad thing (Bid'ah Sayyi ah) he will obtain the punishment for introducing it and also for those who adopt it, will also be punished."

(Sahih Muslim in Kitaab-uz-Zakaat Tirmidhee chapter Eleleven).

This Hadith gives proof of the fact that it is permissible to introduce a good act in Islam, also it gives permission to follow that deed with the intention of reward.

There are many examples, but for the moment we shall highlight two:

Our Prophet [May Allah bless Him and grant Him peace] asked Bilal radiAllahu unho "What do you practice that from which you look forward to a lot of reward from Allah Subha Nahu Wata’ala. The reason being I heard your footsteps in Paradise. (junnaah") Bilal radiAllahu unho replaid: "Whenever I do Ablution (Wudhu,) after it I always say a Prayer (Nafil Salaah")
["Bukhari, Kitab Tahajud"]

This new practice that Bilal RadiAllaho unho started by himself was so much accepted by Allah Ta`ala that our Prophet [May Allah bless Him and grant Him peace] heard his foot steps in paradise.

Ibn Hajr writes in his commentary to worship at a set time is permissible.

[Fathul bari by Hafidhh Asqalani]

2) In a Mosque in Quba an Imam used to lead congregation prayers in every rakat (cycle) after reciting Surah Al Fatiha and a verse of the Qur'an he also recited Surah Al Ikhlas as well. When our Prophet [May Allah bless Him and grant Him peace] asked him: 'Why do you do this? He replied: 'I love reading Surah Al Ikhlas'. Our Prophet [May Allah bless Him and grant Him peace] said: 'This love will take you towards paradise'. [Bukhari Kitab as Salaah]

Our Prophet [May Allah bless Him and grant Him peace] did not stop either of these two companions, but instead gave them inspiration of the glad tidings they were going to receive.