Group Supplication after Every Religious Gathering

Question :

What is the ruling on a group supplicating in unison immediately after reciting the Qur'an, one person saying the supplication and the rest saying "Amin" after his supplication. This occurs in every religious lesson, and when they are asked for the proof they use the saying of Allah Almighty:
"Invoke me, I will respond to your (invocation)."

Answer:

The rule in statements of remembrance and acts of worship is that of conformity, and that Allâh is not to be worshipped except by what He has legislated. This applies to its timing, form, number of units, place, etc.

Regarding what Allâh legislated of statements of remembrance, supplications and the rest of the acts of worship that are not restricted to a time, a place, or a form, we are not allowed to specify that worship to a number of units or a time or a place.

We are only allowed to consistently follow a form of worship at a set time or place when that is what Allah Almighty orders us to do. And since nothing has been related from the Prophet ﷺ-neither saying, action or approval of group supplications after the prayer, or after reading Qur'an, or after every lesson, we should not do so, regardless of whether the Imam supplicates and the followers answer Amin or if they all supplicate together.

This practice is also not known from the Rightly Guided Khalifahs or from the rest of the Companions, may Allah be pleased with them. So whoever supplicates in a group after every prayer, after reading the Qur'an, or after every religious lesson, has innovated in the religion and has brought into it that which does not belong to it. The Prophet ﷺ said:
"Whoever does a deed that is not in accordance with our matter, then it is rejected."

In another narration he said :
"Whoever introduces into this matter of ours what is not of it, then it is rejected."

As for the verse they cite:
"Invoke me, I will respond to your (invocation)."

there is no proof for them in it. This is because they are arguing with a text that is general, not being restricted to the "how" that they have limited it according to what is in the question about their supplications. And the unrestricted must be left unrest- ricted in the case of actions, without restricting it to a specific situation. If a specific form or manner of supplication were legislated, the Messenger of Allâh would have preserved such act himself, and the Rightly Guided Khalifahs would have followed him in doing so. Since we have already established that no such practice has been reported from him nor them, may Allâh be pleased with them and all good is in following the Prophet and his Rightly Guided Khalifahs it can only be evil to be contrary to their way and guidance by following innovations that Allah's Messenger warned against. He ﷺ said,
"Beware of newly invented matters, for every new matter (in religion) is an innovation, and every innovation is astray."

And may the peace and blessings of Allah Almighty be upon Muhammad, and upon his Companions.