It was narrated from Muhammed bin 'Abdullah bin Zaid that his father said that:
The Messenger of Allah was thinking of a horn, and he commanded that a bell be made and it was done. Then 'Abdullah bin Zaid had a dream. He said: I saw a man wearing two green garments, carrying a bell. I said to him, 'O slave of Allah, will you sell the bell?' He said; 'What will you do with it?' I said, 'I will call (the people) to prayer.' He said, 'Shall I not tell you of something better than that?' I said, 'What is it?' he said, 'Say: Allahu Akbar Allahu Akbar, Allahu Akbar Allahu Akbar; Ash-hadu an la ilaha illallah, Ash-hadu an la ilaha illallah; Ash-hadu anna Muhammadan Rasulullah, Ash-hadu anna Muhammadan Rasulullah; Hayya 'alas-salah, Hayya 'alas-salah; Hayya 'alal-falah, Hayya 'alal-falah; Allahu Akbar Allahu Akbar; La ilaha illallah (Allah is The Most Great, Allah is The Most Great; Allah is The Most Great, Allah is The Most Great; I bear witness that none has the right to be worshipped but Allah, I bear witness that none has the right to be worshipped but Allah; I bear witness that Muhammed is the Messenger of Allah, I bear witness that Muhammed is the Messenger of Allah; Come to the Prayer, Come to the Prayer; Come to the prosperity, Come to the prosperity; Allah is the Most great, Allah is the Most Great; None has the right to be worshipped but Allah). 'Abdullah bin Zaid went out and came to the Messenger of Allah, and told him what he had seen. He said, O Messenger of Allah, I saw a man wearing two green garments carrying a bell, and he told him the story. The Messenger of Allah said, Your companion has had a dream. Go out with Bilal to the mosque and teach it to him, for he has a louder voice than you. I ('Abdullah) went out with Bilal to the mosque, and I started teaching him the words and he was calling them out. 'Umar Al-Khattab heard the voice and came out saying, O Messenger of Allah! By Allah, I saw the same (dream) as him. (Hasan)Abu 'Ubaid said: Abu Bakr Al-Hakami told me that 'Abdullah bin Zaid Al-Ansari said concerning that: 'I praise Allah, the Possessor of majesty and honor, A great deal of praise for the Adhan. Since the news of it came to me from Allah, So due to it, I was honored by the information. During the three nights. Each of which increased me in honor.'