Yahya related to me from Malik that Yahya ibn Said said, "TheMessenger of Allah, may Allah bless him and grant him peace, hadwanted to take two pieces of wood to strike them together to gatherpeople for the prayer, and Abdullah ibn Zayd al-Ansari, then of thetribe of Harith ibn al-Khazraj, was shown two pieces of wood in hissleep. He said, 'These are close to what the Messenger of Allah, mayAllah bless him and grant him peace, wants.' Then it was said, 'Doyou not call to the prayer?', so when he woke up he went to theMessenger of Allah, may Allah bless him and grant him peace, andmentioned the dream to him. The Messenger of Allah, may Allah blesshim and grant him peace, ordered the adhan."
App reference: Book 3, Hadith 1
USC-MSA web (English) reference: Book 3, Hadith 1
Arabic reference: Book 3, Hadith 147