Section on al-Fātiḥah
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As for the ḥadīth concerning the Opening Chapter of the Book, it is rigorously authentic in al-Ṣaḥīḥ, where the Prophet ﷺ relates that Allah, exalted is He, says:
“I have divided the Prayer between Myself and My servant into two halves: one half is Mine and the other half is for My servant, and My servant shall have whatever he asks. When the servant says, ‘All praise belongs to Allah, Lord of the worlds,’ Allah says, ‘My servant has praised Me.’ When he says, ‘The All-Merciful, the Ever-Merciful,’ Allah says, ‘My servant has extolled Me.’ When he says, ‘Master of the Day of Recompense,’ Allah says, ‘My servant has exalted Me.’ When he says, ‘You alone we worship and You alone we ask for help,’ He says, ‘This verse is between Me and My servant, and My servant shall have whatever he asks.’ And when the servant says, ‘Guide us to the straight path—the path of those whom You have favoured, not of those who incur Your anger, nor of those who go astray,’ He says, ‘All of this is for My servant, and My servant shall have whatever he asks.’”
It is also authentically recorded in Ṣaḥīḥ Muslim from Ibn ʿAbbās who said: While Gabriel was sitting with the Prophet ﷺ, he heard a creaking sound above him. He lifted his head and said, “This is a gate in heaven that has opened today; it has never been opened before.” From it an angel descended, and Gabriel said, “This is an angel who has come down to earth; never before has he descended.” The angel greeted and said, “Receive glad tidings of two lights that have been granted to you which no prophet before you was ever given…"