Sunan an-Nasa'i 4143

It was narrated that Qais bin Muslim said:" Iasked Al-Hasan bin Muhammad about the saying of Allah, the Might and Sublime: 'and know that whatever of spoils of war that you may gain, verily, one-fifth of it is assigned to Allah. He said: 'This is the key to the Speech of Allah. This world and the Hereafter belling to Allah. He said: 'They differed concerning these two shares after the death of the Messenger of Allah, the share of the Messenger and the share of the near relatives (of the Messenger of Allah). Some said that the share of the near relatives was for the relatives of the Messenger, and some said that the share of the near relatives was for the relatives of the Khalifah. Then they agreed that these two shares should be spent on horses and equipment in the cause of Allah, and they were allocated for this purpose during the Khalifah of Abu Bakr and' Umar