It was narrated that Jabir said “I attended the prayer with the Messenger of Allah (pbuh) on the day of ‘Eid. He started with the prayer before the Khutbah, with no Adhan and no Iqamah. When he finished the prayer, he stood leaning on Bilal, and he praised and glorified Allah (SWT) and exhorted the people, reminding them and urging them to obey Allah (SWT). Then he moved away and went to the women, and Bilal was with him. He commanded them to fear Allah (SWT) and exhorted them and reminded them. He praised and glorified Allah, then he urged them to obey Allah, then he said: ‘Give charity, for most of you are the fuel of Hell.’ A lowly woman with dark cheeks said: ‘Why, O Messenger of Allah?’ He said: ‘You complain a great deal and are ungrateful to your husbands.’ They started taking off their necklaces, earrings and rings, throwing them into Bilal’s garment, giving them in charity.” (Sahih)
Sahih Muslim Book 4 Hadith 735
Ibn Umar reported: When the Muslims came to Medina, they gathered and sought to know the time of prayer but no one summoned them. One day they discussed the matter, and some of them said: Use something like the bell of the Christians and some of them said: Use horn like that of the Jews. Umar said: Why may not a be appointed who should call (people) to prayer? The Messenger of Allah (Peace be upon him) said: O Bilal, get up and summon (the people) to prayer.