The ruling on specifying the sending of blessings upon the Prophet after the adhan

Question:
May Allah reward you with good. We begin this session with a question from the questioner Abu 'Amir A. A. He says: After the completion of the adhan, the mu'adhdhin repeats, after a pause, "O Allah, send blessings upon our Prophet Muhammad and upon his family and all his Companions," or "Send blessings upon our Prophet Muhammad (peace and blessings be upon him)." Is this phrase transmitted?

Answer:
(Peace and blessings be upon him). It is prescribed and required. Allah the Exalted said: This is among his rights (peace and blessings be upon him) over us. He (peace and blessings be upon him) said: "Whoever sends blessings upon me once, Allah will send blessings upon him." He (peace and blessings be upon him) also said: However, it is not permissible to specify a time for it for which no evidence has come, such as specifying the sending of blessings upon the Messenger after the adhan or before the adhan. There are two dangers in this: First, it is an innovation in the religion with no evidence for it, making it a bid'ah (religious innovation), a weak bid'ah. Second, this is a means to adding to the adhan; the ignorant may think that these words and these blessings are part of the adhan, and that the adhan of one who does not do them is not valid. It is obligatory to avoid bid'ah and newly invented matters.