The Expedition of al Raji occurred directly after the Battle of Uhud in the year AH 4[2] of the Islamic calendar.
However, those emissaries were sent by the Banu Lahyan, who wanted to avenge the killing of their chief, Khalid bin Sufyan al-Hadhali in the Expedition of Abdullah Ibn Unais.
[1] In a differing account in Sahih al-Bukhari, ten men were sent in all, and they were sent as spies, "to bring the enemy's secrets.
So they set out, and when they reached (a place) between 'Usfan and Mecca, they were mentioned to one of the branch tribes of Bani Hudhail called Lihyan.
The Muslim jurist Ibn Qayyim Al-Jawziyya also mentions the event in his biography of Muhammad, Zad al-Ma'ad.
[3] Modern secondary sources which mention this, include the award-winning book,[11] Ar-Raheeq Al-Makhtum (The Sealed Nectar).
[10] The event is mentioned in the Sahih Muslim hadith collection as follows: Anas reported that the Messenger of Allah (may peace be upon him) observed Qunut for one month invoking curse upon some tribes of Arabia (those who were responsible for the murders in Bi'r Ma'una and Raji'), but then abandoned it Sahih Muslim, 4:1442According to Ar-Raheeq Al-Makhtum (The Sealed Nectar), the event is also mentioned in the Sahih al-Bukhari hadith collection.