Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) narrates that on the day of Uhud the blessed face of the Messenger of Allah (peace and blessings be upon him) was wounded, so Malik bin Sinan (may Allah be pleased with him) came forward and sucked the blood from the wound of the Messenger of Allah (peace and blessings be upon him). He said: "Whoever would like to see the one whose blood has mixed with my blood, let him look at Malik bin Sinan."
Hadith Referenceالمعجم الكبير للطبراني / باب السين / 5411