'Day of Bi'r Ma'una') was the killing of Muslim missionaries by the Mushrikites four months after the Battle of Uhud in 625 (4 AH).
`Amr [Tabari Volume 7, p. 151] [4]Ibn Ishaq's Biography claims that forty men were sent to them; but Sahih al-Bukhari states that there were 70— Al-Mundhir bin ‘Amr, one of Banu Sa‘ida, nicknamed ‘Embraces Death’ — commanded that group, who were the best and most learned in the Qur'an and jurisprudence.
However, the people did not respond positively to this proposal due to the fact that Amir ibn Malik had guaranteed the safety of members of the delegation.
With his provocation, armed groups from the neighboring tribes attacked the Muslims waiting at Bi'r Al-Mauna and completely unaware of any of these developments.
Some time later, a Muslim delegation from the Banu Amir ibn Sa'sa' came to Muhammad and requested that the women taken captive be released.
[5] The background for the Abdullah Ibn Unais expedition revealed that Sufyan (tribal chief) was on his way to kill Muslims.
The Muslim jurist Ibn Qayyim Al-Jawziyya also mentions the event in his biography of Muhammad, Zad al-Ma'ad.
[6] Modern secondary sources which mention this, include the award-winning book,[7] Ar-Raheeq Al-Makhtum (The Sealed Nectar).
[8] The event is also mentioned by the Muslim jurist Ibn Qayyim Al-Jawziyya in his biography of Muhammad, Zad al-Ma'ad.
Sahih al-Bukhari, 5:59:405The event is also mentioned in the Sahih Muslim hadith collection as follows: Anas b. Malik reported that the Messenger of Allah (may peace be upon him) invoked curse in the morning (prayer) for thirty days upon those who killed the Companions (of the Holy Prophet) at Bi'r Ma'una.