Ansar (Arabic: الأنصار al-Anṣār The Helpers) is an Islamic term that literally means "helpers" and denotes the Medinan citizens that helped the Islamic prophet, Muhammad and the Muhajirun on the arrival to the city after the migration to Medina and waged war for the cause of Islam. They belonged to two main tribes, the Banu Khazraj and the Banu Aus.
The following Ansari are known by name:
- Abd-Allah ibn Ubayy, chief
- Sa'd ibn Ubadah, chief
- As'ad ibn Zurarah
- 'Abd Allah ibn Rawahah
- Abu Ayyub al-Ansari
- Ubay ibn Ka'b
- Zayd ibn Thabit
- Hassan ibn Thabit
- Jabir ibn Abd-Allah
- Amr ibn al-Jamuh
- Sa`ad ibn ar-Rabi`
- Al-Bara' ibn `Azib
- Ubayda ibn as-Samit
- Abu Sa‘id al-Khudri
- Zayd ibn Arqam
- Abu Dujana
- Abu Darda
- Habab ibn Mundhir
- Anas ibn Malik
- Al-Bara' ibn Malik
- Sahl ibn Sa'd
- Farwah ibn `Amr ibn Wadqah al-Ansari
Battles where they helped Muhammad
The Ansar helped Muhammad in several battles. One of the earliast battles they helped him in was the Invasion of Buwat. A month after the raid at al-Abwa that was ordered by Muhammad, he personally led two hundred men including Muhajirs and Ansars to Bawat, a place on the caravan route of the Quraysh merchants. A herd of fifteen hundred camels was proceeding, accompanied by one hundred riders under the leadership of Umayyah ibn Khalaf, a Quraysh. The purpose of the raid was to plunder this rich Quraysh caravan. No battle took place and the raid resulted in no booty. This was due the caravan taking an untrodden unknown route. Muhammad then went up to Dhat al-Saq, in the desert of al-Khabar. He prayed there and a mosque was built at the spot. This was the first raid where a few Ansars took part. 
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