It was narrated from Abu Hurayrah that the Prophet (peace and blessings of Allaah be upon him) said: “Whoever offers a prayer in which he does not recite Umm al-Kitaab (i.e., al-Faatihah), it is defective” – and he said it three times. It was said to Abu Hurayrah, (What if) we are behind the imam? He said, Recite it to yourself, for I heard the Messenger of Allaah (peace and blessings of Allaah be upon him) say, “Allah said: I have divided prayer between Myself and My slave into two halves, and My slave shall have what he has asked for. When the slave says: Al-hamdu lillahi rabbi l-alamin (All the praises and thanks be to Allaah, the Lord of the ‘Aalameen (mankind, jinn and all that exists), Allah says: My slave has praised Me.
And when he says: Ar-Rahmaan ir-Raheem (The Most Gracious, the Most Merciful), Allah (mighty and sublime be He) says: My slave has extolled Me
and when he says: Maaliki yawm id-deen (The Only Owner (and the Only Ruling Judge) of the Day of Recompense (i.e. the Day of Resurrection)), Allah says: My slave has glorified Me – and on one occasion He said: My slave has submitted to My power.
And when he says: Iyyaaka na’budu wa iyyaaka nasta’een (You (Alone) we worship, and You (Alone) we ask for help (for each and everything)), He says: This is between Me and My slave, and My slave shall have what he is asking for.And when he says: Ihdina’s-siraata’l- mustaqeem, siraat alladheena an’amta alayhim ghayril-maghdoobi alayhim wa la’ d-daalleen (Guide us to the Straight Way. The way of those on whom You have bestowed Your Grace, not (the way) of those who earned Your Anger, nor of those who went astray), He says: This is for My slave, and My slave shall have what he has asked for.”
(Narrated by Muslim)
This is one of the clearest evidences that it is not a verse from Alfatiha. It is a separate verse that separates Surah from others and it is the beginning if all surahs except Surah 9