Q: Regarding what some people do here in Jordan and in other countries on hearing the Mu'adhin (caller to Prayer) conclude the Adhan (call to prayer) saying: "O Allah, send Your blessings on our master Muhammad, his family and Companions." Is it permissible? What is the ruling on this?
A: This issue requires explaining. If the Mu'adhin says it inaudibly, it is permissible for him and for whoever replies after him. The Prophet (peace be upon him) stated:
Whenever you hear the Mu'adhin, say what he says then confer peaces upon me, for whoever confers blessings upon me once, Allah will confer ten blessings upon him, then ask Allah to grant me AlWasilah, which is a rank in Jannah (Paradise) that will be granted to only one servant of Allah, and I hope I will be this one, and whoever asks (Allah) to grant me AlWasilah, the intercession will be his right.
Whoever recites: "O Allah, Lord of this perfect Da`wah (call) and the established Salah (prayer), grant Muhammad the Wasilah and superiority, and raise him up to the praiseworthy rank, which You have promised him" upon hearing Adhan, my intercession will be their right on the Day of Resurrection.
But if the Mu'adhin pronounces this audibly the same way he pronounces the Adhan, this is a Bid`ah (innovation in Islam), because he gives people the false impression it is part of the Adhan. Thus, this addition to the Adhan is impermissible, as the concluding words of the Adhan are 'La ilaha Illa Allah (There is no deity but Allah)'. It is impermissible to add anything after that, for had there been any good in this, the Salaf (righteous predecessors) would have been the first to do so. Not only this, but for a greater reason, which is that Prophet would have taught and prescribed it to his Ummah (community).
Whoever performs an act which is not of our affair, i.e. religion, it is to be rejected.
I ask Allah (Glorified be He) to grant us and all our brothers a profound understanding of Islam, and support us in abiding by it, for He is the AllHearer, EverNear. Assalamu `alaykum warahmatullah wabarakatuh (May Allah's Peace, Mercy, and Blessings be upon you!)