What is the ruling on adding the word "our master" in the adhan, such that one says, "I bear witness that our master Muhammad is the Messenger of Allah"?

The questioner:
Some people in our village insist on adding the phrase or word "our master" in the adhan, saying, "I bear witness that our master Muhammad is the Messenger of Allah," instead of "I bear witness that Muhammad is the Messenger of Allah." Is this permissible in the adhan specifically? I have advised them many times that this is not permissible, for the adhan is based on the Prophet's specific instruction. We ask that you please inform the people of the truth in this matter. May Allah reward you with good.

The Shaykh:
The matter is as the questioner stated: this is a bid'ah (religious innovation), because it was not part of the guidance of the Messenger (peace and blessings be upon him). The Messenger (peace and blessings be upon him) taught his ummah (Muslim community) the adhan with these specific, clear words, which have been passed down from generation to generation and studied, praise be to Allah. Whoever adds anything extra to it is an innovator. Adding "our master" to "I bear witness that our master Muhammad is the Messenger of Allah" is a bid'ah. The word "our master" in this context is a bid'ah, because the Messenger (peace and blessings be upon him) did not teach it to his Companions, nor did he command it. Yes, he is our master (peace and blessings be upon him) without a doubt.

The presenter:
Yes.

The Shaykh:
He is the master of the children of Adam, but the acts of worship that the Messenger (peace and blessings be upon him) legislated and clarified, and which the Muslims have practiced from generation to generation, must not be altered, added to, or subtracted from based on people's personal preferences or desires. This is among the newly invented innovations, and every innovation is misguidance. Yes.

The presenter:
May Allah reward you with good, and may He do you good.