The Prophet ﷺ took the cup, performed wudūʾ from it, then spread four of his fingers across its rim and said,

“Come forward and perform your wudūʾ.”

The people performed wudūʾ until each of them had completed what he needed. ʿAlī al-Ḥasan said: Anas was asked, “How many were they?” He replied, “Seventy or eighty.” Al-Bukhārī likewise transmitted the report through ʿAbd al-Raḥmān ibn al-Mubārak al-Anṣī, from Ḥazm ibn Mihrān al-Quṭaʿī (1).

Another chain from Anas:

Imām Aḥmad (2) relates: Ibn Abī ʿAdiyy narrated to us—via Ḥumayd and Yazīd—who said: Ḥumayd al-Maʿnā informed us, from Anas ibn Mālik:

“The call to prayer was made, and those whose homes were near the mosque rose at once, whereas those who lived farther away remained seated. The Messenger of Allah ﷺ was brought a stone wash-basin, yet it was too small for him to spread his palm inside it, so he drew his fingers together. Then the rest of the people performed their wudūʾ. Ḥumayd said: Anas was asked, ‘How many were they?’ He answered, ‘Eighty, or a little more.’”

Al-Bukhārī (3) also records—through ʿAbd Allāh ibn Munayr, from Yazīd ibn Hārūn, from Ḥumayd, from Anas ibn Mālik—who said:

“When the time for prayer arrived, the men whose houses were near the mosque went to make wudūʾ, while others stayed behind. The Messenger of Allah ﷺ was brought a stone wash-basin containing some water. He placed his hand within it, but the basin was too small for him to spread out his palm, so he gathered his fingers and set them in the basin. All the people then performed wudūʾ. I asked, ‘How many were they?’ He said, ‘Eighty men.’”

Another route from him:

Imām Aḥmad (4) narrates: Muḥammad ibn Jaʿfar told us; Saʿīd dictated to us, from Qatādah, from Anas ibn Mālik:

“The Messenger of Allah ﷺ was at al-Zawrāʾ. He was brought a vessel of water that did not even cover his fingers. He ordered his Companions to perform wudūʾ, placed his palm in the vessel, and water began to gush from between his fingers and their tips until the people had completed their wudūʾ. I asked Anas, ‘How many were you?’ He replied, ‘We were three hundred.’”

Al-Bukhārī transmits the same through Bundār, from Ibn Abī ʿAdiyy; and Muslim through Abū Mūsā (5), from Ghundar—both from Saʿīd ibn Abī ʿArūbah (some say from Shuʿbah, but the sound version is Saʿīd)—from Qatādah, from Anas, who said:

“The Messenger of Allah ﷺ was brought a vessel of water while he was at al-Zawrāʾ. He placed his hand in it and water flowed from between his fingers, so the people performed wudūʾ.” Qatādah added: “I asked Anas, ‘How many were you?’ He replied, ‘Three hundred, or just under three hundred.’” This is al-Bukhārī’s wording.

The report of al-Barāʾ ibn ʿĀzib concerning the same event:

Al-Bukhārī (6) states: Mālik ibn Ismāʿīl related to us; Isrāʾīl related to us, from Abū Isḥāq, from al-Barāʾ ibn ʿĀzib, who said: “We were fourteen hundred on the day of al-Ḥudaybiyah, and al-Ḥudaybiyah was a well; we drew from it until …”