Sahih Muslim
1796.01

It has been narrated on the authority of Jundub b. Sufyan who said:A finger of the Messenger of Allah (ﷺ) was wounded in one of the encounters He said: Thou art just a little finger which has bled, and what thou hast experienced is in the cause of Allah

1796.02

It has been narrated on the authority of Aswad b. Qais who said:The Messenger of Allah (ﷺ) was in a cave (or raid) when his finger was hurt