Hasan says that when you hear the voice of the muezzin, say the same words that the muezzin says. However, when he says "Hayya 'ala-s-Salah," you should say, "La hawla wa la quwwata illa billah." When he says "Qad qamatis salah," you should say these words: "O Allah! O Lord of this perfect call and the prayer that is to be established after it! Grant Muhammad (peace be upon him) on the Day of Resurrection that which he has asked of You." Whoever supplicates with this prayer at the time of Iqamah, Allah will include him in the intercession of the Prophet (peace be upon him) on the Day of Resurrection.

Hazrat Qatadah narrates that when Hazrat Usman heard the voice of the muezzin, he would repeat the same words as the muezzin during the tashahhud and takbeer. However, when the muezzin said "Hayya 'ala-s-Salah," he would say "Ma sha' Allah, wa la hawla wa la quwwata illa billah," and when the muezzin said "Qad qamatis salah," he would say: "Welcome to those who speak of justice and truth, and welcome to the prayer," and then he would stand up for the prayer.

Hazrat Abdullah bin Shaqiq says that a sign of hardness of the heart is that you hear the muezzin saying La ilaha illallah, Allahu Akbar, but you do not respond to it.

Hazrat Abdullah says that a sign of the hardness of the heart is that you hear the voice of the muezzin but do not repeat the words that he says.