The ruling on saying (May Allah establish it and make it permanent) when the prayer is being called for

Question:
When the imam of the mosque stands in the mihrab when the prayer is being called for, he says: "May Allah establish it and make it permanent. O Allah, Lord of this perfect call and this established prayer, grant Muhammad the intercession and the high rank, and raise him, O Allah, to the praised station that You promised him. Indeed, You do not break Your promise." Is this a transmitted supplication, or is there something else, or is this the best?

Answer:
This is said in the adhan. When he finishes the adhan, he sends blessings upon the Prophet (peace and blessings be upon him) and says: This is how the hadith came from the Messenger of Allah (peace and blessings be upon him), as narrated by al-Bayhaqi, with the addition: This is a recommended practice after the adhan, and the iqamah is a second adhan that is said after it.
As for (May Allah establish it and make it permanent), there is a weak hadith regarding it. It is better to say: "The prayer has begun," just as the mu'adhdhin says: "The prayer has begun, the prayer has begun," instead of (May Allah establish it and make it permanent), because the phrase (May Allah establish it and make it permanent) has a weak report that is not authentic from the Prophet (peace and blessings be upon him). Rather, one should say what the Prophet (peace and blessings be upon him) said: Meaning, he says: "The prayer has begun, the prayer has begun." In the adhan of Fajr, when he says: "Prayer is better than sleep," he says: "Prayer is better than sleep" in the same way.
As for "Hasten to prayer" and "Hasten to success," he says: "There is no power and no strength except with Allah"; because the report regarding this is authentic from the Prophet (peace and blessings be upon him) that he used to say at "Hasten to prayer": and at "Hasten to success" he says: This is in the adhan and the iqamah.

Question: Meaning, we did not hear him say: "O Allah, Lord of this perfect call," what was it?

Answer: No, no, after the adhan and after the iqamah it is normal; because they are all adhan.

Question: Regarding Oman, is their iqamah exactly like the adhan?

Answer: It is a second opinion among the scholars, narrated by Abu Juhayfah. The adhan has types, and the iqamah has types, so there is no harm if they are applying the hadith of Abu Juhayfah. There is no harm, it is like the adhan, yes. But the adhan of Bilal is better, which was before the Prophet (peace and blessings be upon him), our iqamah, and our adhan now.