Mishkat al-Masabih #610

‘Abdallah b. ‘Amr b. al-‘As reported God's Messenger as saying, “When you hear the mu’adhdhin repeat what he says, then invoke a blessing on me, for everyone who invokes one blessing on me will receive ten blessings from God. Then ask God to give me the wasila, which is a rank in paradise fitting for only one of God’s servants, and I hope that I may be the one. If anyone asks that I be given the wasila, he will be assured of my intercession.” Muslim transmitted it.