The Virtues of Surah al'Fatiha

There are a number of ahaadeeth explaining to us the great virtue of this chapter:

1. Muslim reports from Abu Hurayrah Radi Allah Anhu who said that the Messenger of  Allah Sallalahu Alayhi Wasallam said, Allah, the Glorious and Exalted said, "I have divided the prayer between Myself and my servant equally and My servant shall be granted what he asked  for." Therefore when the servant says, 'all praises and thanks are due to Allah, the Lord of the universe', Allah says, 'My servant has praised Me.' When he says, 'the Most Beneficent, the Most Merciful,' Allah says, 'My servant has extolled Me.' When he says, 'Master of the Day of Judgement,' Allah says, 'My servant has glorified Me.' When he says, 'You Alone we worship and Your aid Alone do we seek,' Allah says, 'this is between Me and My servant and My servant shall have what he requested.' When he says,  'guide us to the Straight Path, the Path of those whom You have favoured, not of those who have incurred [Your] wrath, neither of those who have gone astray,' Allah says, 'this is for My servant and My servant shall have what he asked for.' [SahihMuslim [<?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:country-region><st1:place>Eng.</st1:place></st1:country-region> Trans. 1/215 no. 775]]

2. At-Tirmidhee reports from Abu Hurayrah Radi Allah Anhu who said that the Messenger  of Allah Sallalahu Alayhi Wasallam said,

[The chapter commencing with], "all praises and thanks are due to Allah the  Lord of the Universe" is the Mother of the Quran, the Mother of the Book,  the Seven Oft Repeated Verses and the Great Quran. [i.e. Ummul Quran,  Ummul Kitaab, Sab`ul Mathaanee and al-Quranul Adheem. Reported by  at-Tirmidhee [no. 3344] and it is Sahih as stated by al-Albaanee in 'Sahih Sunan at-Tirmidhee' [no. 2498].]

3. Ahmad reports from Abu Hurayrah Radi Allah Anhu who said,

".The Messenger of Allah (sallallahu alahi wa-sallam)  asked, "would you  like me to teach you a Surah the likes of which is not to be found in the  Torah, Injeel, Zaboor or the [rest of the] Quran?" He said, "yes O  Messenger of Allah." The Prophet Sallalahu Alayhi Wasallam said, "I hope that I will not leave  this door until you know it."

Ubayy said, "then he took hold of my hand and talked to me while I slowed  down fearing that we may reach the door before he finished talking. When we did reach it I asked him, 'what is the Surah you promised me, O Messenger of  Allah?' He said, 'what is the Surah you recite in prayer?' So I recited  the Mother of the Quran upon which he said, 'by the One in Whose Hand is  my soul, Allah has not revealed the likes of it in the Torah, Injeel,  Zaboor or the [rest of the] Quran. It is the Seven Oft-Repeated verses.'"  [Ahmad [5/114], ibn Khuzaymah [1/252 no. 500] and others. Its isnaad was  declared Sahihby Mustafaa al-A`dhamee in his takhreej to ibn Khuzaymah]

4. Ahmad reports from Abu Sa`d ibn al-Mu`allaa Radi Allah Anhu who said,

"...... He {(Prophet (sallallahu alahi wa-sallam)}  then said, "I will teach
a Surah which is the greatest Surah in the Quran before you leave the  Mosque." Then he grasped hold of my hand and when he intended to leave [the  Mosque], I asked him, "did you not say that you would teach me a Surah which  is the greatest Surah in the Quran?" He replied, "yes. It is [the Surah  commencing with], 'All praise and thanks are due to Allah.' It is the Seven  Oft-Repeated verses and the Great Quran that has been given to me."  [Bukhari [Eng. Trans. 6/1 no.1], Ahmad [3/450] and the wording is his]

5. Muslim reports from ibn Abbaas Radi Allah Anhu who said,

While the Messenger of Allah Sallalahu Alayhi Wasallam was sitting with Jibreel he heard a  creaking sound above him. Jibreel looked up and said, "this is [the sound  of] a gate that has been opened in heaven today and has never been
previously opened." Then an Angel descended through it and came to the  Prophet Sallalahu Alayhi Wasallam and said, "rejoice in the good news of two lights that have  been given to you such as no prophet before you has been given. [They are]  Surah al-Faatihah and the concluding [two] verses of Surah al-Baqarah. You  will never recite a word from them without being given the blessings they  contain." [SahihMuslim [
<st1:country-region><st1:place>Eng.</st1:place></st1:country-region> Trans. 2/586 no. 1759]]

This hadeeth has led some scholars to suggest that Jibreel did not convey  the revelation of Surah al-Faatihah and the last two verses of al-Baqarah,  rather it was the Angel mentioned in this hadeeth. However the correct  opinion is that Jibreel did indeed convey the revelation of these verses as  he was enjoined by Allah to convey the entire Quran to the Prophet Sallalahu Alayhi Wasallam.

The Angel that descended as mentioned in this hadeeth descended only to  convey the reward of these verses.

Reference:
Tafseer of Surah al-Fatihah, compiled by Abu Rumaysah,(This commentary is a compilation gathered from a number of commentaries written.) These being: Tafseer at-Tabaree
Tafseer al-Qurtubi [Jaami lil Ahkaam al-Quran]
Tafseer ibn Katheer
Tafseer ash-Shawkanee [Fath al-Qadeer]
Tafseer as-Sa`dee [Tayseer al-Kareem ar-Rahmaan]
Tafseer ash-Shanqeetee [Adwaa al-Bayaan fee Eedaah al-Quran bil Quran].