I had listened to a qari reciting surah fatihah and he recited 'IHDINAZERATAL MUSTAQIM." can you please clarify it for me?

Question
I had listened to a qari reciting surah fatihah and he reciete 'IHDINAZERATAL MUSTAQIM. " Can you please clarify it for me as to why he read like that, because it is supposed to be  "IHDINASERATAL MUSTAQIM."
Jazakallahu khairan.

Answer
The riwaayah of Khalaf 'an Hamzah reads the letter  in the words  and wherever they are in the Qur'an as a mixture of a and a .     The sound is like a , but with tafkheem and .    Khallaad 'an Hamzah reads just the first word and only in surah Al-Faatihah with the mixing of the sound of the and .  


Wa iyyaaakum.