Khalifah of Rasulullah Hazrat Abu Bakr Umar R.A.careful about tongue

Aslam Rahimahullah narrates that 'Umar ibn Khattab Radiyallahu 'anhu saw Abu Bakr pulling his tongue. 'Umar asked: 

O Khalifah of Rasulullah! What are you doing? He said: Indeed this tongue has brought me to the place of destruction. Rasullullah Sallallahu 'alaihi wasallam said: There is no part of the body that does not complain to the tongue of its sharpness for its speaking evil.