Hadith 681:12
I heard Jundub say: The finger of the Messenger of Allah, peace and blessings of Allah be upon him, bled. He said: "Are you anything but a finger that has bled? And in the way of Allah is what you have encountered."
وسمعت جندبا يقول: دميت إصبع رسول الله صلى الله عليه وسلم، فقال: " هل أنت إلا إصبع دميت وفي سبيل الله ما لقيت "