How to give reply to Azan

What should the One Who hears the Mu'aththin say?
What should the One Who hears the Mu'aththin say?

What should the One Who hears the Mu'aththin say? Question :Is it authentic to say, after hearing the Athan and supplic...
The Mu'aththin called the Athan while I was praying the Sunnah of Fajr
The Mu'aththin called the Athan while I was praying the Sunnah of Fajr

The Mu'aththin called the Athan while I was praying the Sunnah of Fajr Question :I entered the mosque at Fajr time and ...