وعض رجل يد رجل - يعني فانتزع ثنيته - فأبطله النبي صلى الله عليه وسلم

The English translation is not shown here: its source is not yet cleared for public display.

Sahih al-Bukhari, vol. 3, p. 17, no. 1848. Not yet checked against the printed edition.