The remembrance and supplication after the adhan other than what is established

Question:
In some countries, people among you recite remembrance after the adhan, and they know that this is not a sunnah (recommended practice). What is the ruling on that? And do you disapprove of this to them?

Answer:
Yes, you disapprove of it. What is it? It is a bid'ah (religious innovation). It is a bid'ah, except for the supplication that was reported from the Messenger (peace and blessings be upon him) that he would say after the adhan in its entirety to the end. One does not raise one's voice with it; rather, one supplicates between oneself and Allah. And whatever is added to that, it becomes a bid'ah. Yes.