Khuzaima ibn Thabit Dhu'sh-Shahadatain al-Ansari (Arabic: خزيمة بن ثابت ذو الشهادتين الأنصاري; d. July 657) was one of the companions of Prophet Muhammad.
He was an Ansar and one among those on whose authority the Hadith of the pond of Khumm was reported.
He was among those who initially refused to give allegiance to Abu Bakr.
Uthman bin Affan told the sahaba to gather the Quran so they can compile it into an official book. Up to that point, it was memorized by the sahaba and kept together written on various materials.
In the Itqan, Al-Suyuti discussed the number of witnesses required for writing down a revelation of the Islamic prophet Muhammad.
He was a general under Ali's command during the Battle of the Camel (656), riding in the head of 1000 Ansar cavaliers.
He died in the Battle of Siffin (657), fighting on the side of Ali.