http://www.usc.edu/dept/MSA/fundamentals/hadithsunnah/bukhari/032.sbt.htmlNarrated Abu Huraira:
Allah's Apostle said, "Whoever prayed at night the whole month of Ramadan out of sincere Faith and hoping for a reward from Allah, then all his previous sins will be forgiven." Ibn Shihab (a sub-narrator) said, "Allah's Apostle died and the people continued observing that (i.e. Nawafil offered individually, not in congregation), and it remained as it was during the Caliphate of Abu Bakr and in the early days of 'Umar's Caliphate." 'Abdur Rahman bin 'Abdul Qari said, "I went out in the company of 'Umar bin Al-Khattab one night in Ramadan to the mosque and found the people praying in different groups. A man praying alone or a man praying with a little group behind him. So, 'Umar said,
'In my opinion I would better collect these (people) under the leadership of one Qari (Reciter) (i.e. let them pray in congregation!)'. So, he made up his mind to congregate them behind Ubai bin Ka'b. Then on another night I went again in his company and the people were praying behind their reciter. On that, 'Umar remarked,
'What an excellent Bid'a (i.e. innovation in religion) this is; but the prayer which they do not perform, but sleep at its time is better than the one they are offering.' He meant the prayer in the last part of the night. (In those days) people used to pray in the early part of the night."
He even did this when we there are clear sunni hadith, which say that Rasool (s) was angered by this (please note the clear command by Rasool (s) at the end of this hadith) :
http://www.usc.edu/dept/MSA/fundamentals/hadithsunnah/bukhari/073.sbt.html#008.073.134Volume 8, Book 73, Number 134:
Narrated Zaid bin Thabit:
Allah's Apostle made a small room (with a palm leaf mat). Allah's Apostle came out (of his house) and prayed in it. Some men came and joined him in his prayer. Then again the next night they came for the prayer, but Allah's Apostle delayed and did not come out to them. So they raised their voices and knocked the door with small stones (to draw his attention). He came out to them
in a state of anger, saying, "You are still insisting (on your deed, i.e. Tarawih prayer in the mosque) that I thought that this prayer (Tarawih) might become obligatory on you.
So you people, offer this prayer at your homes, for the best prayer of a person is the one which he offers at home, except the compulsory (congregational) prayer." http://www.usc.edu/dept/MSA/fundamentals/hadithsunnah/muslim/004.smt.html#004.1708Book 004, Number 1708:
Zaid b. Thabit reported: The Messenger of Allah (may peace be upon him) made an apartment with the help of the leaves of date trees or of mats. The Messenger of Allah (may peace be upon him) went out to pray in it. People followed him and came to pray with him. Then they again came one night and waited (for him), but the Messenger of Allah (may peace be upon him) delayed in coming out to them. And when he did not come out, they cried aloud and threw pebbles at the door. The Messenger of Allah (may peace be upon him)
came out in anger and said to them: By what you have been constantly doing, I was inclined to think that it (prayer) might not become obligatory for you.
So you must observe prayer (optional) in your houses, for the prayer observed by a man in the house is better except an obligatory prayer. 
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