Musannaf Ibn Abi Shayba 37:243

Yazid ibn Harun narrated to us, he said: Al-Awwam ibn Hawshab informed us, he said: Sa'id ibn Jumhan narrated to me, from Ibn Abi Bakrah, from his father, who said: The Messenger of Allah (peace and blessings of Allah be upon him) mentioned a land called Al-Basrah or Al-Basirah, next to which is a river called the Tigris, which has many palm trees. The Banu Qantura will descend upon it. The people will then divide into three groups: a group that will join their origins and perish; a group that will take upon themselves [to save themselves] and disbelieve; and a group that will place their offspring behind their backs and fight. Their slain will be martyrs, and Allah will grant victory to those who remain of them.