Strengthening the Ummah

Allah's Messenger (ﷺ) sent us (to fight) against Al-Huraqa (one of the sub-tribes) of Juhaina. We reached
those people in the morning and defeated them. A man from the Ansar and I chased one of their men
and when we attacked him, he said, "None has the right to be worshipped but Allah." The Ansari
refrained from killing him but I stabbed him with my spear till I killed him. When we reached
(Medina), this news reached the Prophet. He said to me, "O Usama! You killed him after he had said,
'None has the right to be worshipped but Allah?"' I said, "O Allah's Messenger (ﷺ)! He said so in order to
save himself." The Prophet (ﷺ) said, "You killed him after he had said, 'None has the right to be
worshipped but Allah." The Prophet (ﷺ) kept on repeating that statement till I wished I had not been a
Muslim before that day.