The ruling on calling out “The prayer is gathered” in the festival prayer and the prayer for rain

Your Eminence! Those who call out in the festival prayer and the prayer for rain, saying “The prayer is gathered,” is there anything wrong with them for doing so?
Answer: We know no basis for this, and it should be left off; because in the legal limit, it is a religious innovation (bid'ah). So it should not be said: “The prayer is gathered,” nor for the festival prayer, nor for the tarawih prayer. All of this should not be done. It is only said for the eclipse prayer: “The prayer is gathered” only. It came in the authentic hadith from the Messenger of Allah (peace and blessings be upon him): This is specific to the eclipse. Yes.
The presenter: And the lunar eclipse?
The Shaykh: It is like it, both the moon and the sun. And when he (peace and blessings be upon him) wanted to gather the people for an important matter, he would say: “The prayer is gathered.” (peace and blessings be upon him). He would gather them for an important matter and call out to them: “The prayer is gathered”; to inform them of an important matter. (peace and blessings be upon him). Yes.
The presenter: As for the festival prayer and the prayer for rain?
The Shaykh: It is not reported.
The presenter: So nothing of that is prescribed?
The Shaykh: Yes.
The presenter: May Allah reward you with good. If someone does it, should it be refuted to him?
The Shaykh: He knows, he rebukes him... he knows that this is not prescribed. Jabir (may Allah be pleased with him) said: and he was pleased with it: ... he prayed for Muhammad, and so it is with the prayer for rain. Yes.
The presenter: May Allah reward you with good.