question #1 Sahih Muslim 384, Book 4, Hadith 13 : What is the significance of repeating the words of the Mu’adhdhin during the call to prayer?

When you hear the Mu’adhdhin, repeat what he says, then invoke a blessing on me, for everyone who invokes a blessing on me will receive ten blessings from Allah; then beg from Allah al-Wasila for me, which is a rank in Paradise fitting for only one of Allah’s servants, and I hope that I may be that one. If anyone who asks that I be given the Wasila, he will be assured of my intercession.