Praise be to Allah.
If he says Hayya ‘ala al-Falaah (come to prosperity) before Hayya ‘ala al-salaah (come to prayer), he has to repeat Hayya ‘ala al-Falaah (come to prosperity) after saying Hayya ‘ala al-salaah (come to prayer), because it is essential that the phrases of the adhaan be given in the right order. The adhaan was narrated in this particular order, so if a person inverts the phrases, he is doing something that is not in accordance with the command of Allaah and His Messenger, and the Prophet (peace and blessings of Allaah be upon him) said: “Whoever does something that is not in accordance with this matter of ours will have it rejected.” End quote.
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