'Abdullah Radiyallahu 'anhu narrates that he heard Rasullullah Sallallahu 'alaihi wasallam saying:
Most of the faults that the son of Adam commits are by his tongue. (Tabrani, Majma-'uz-Zawaid)
Most of the faults that the son of Adam commits are by his tongue. (Tabrani, Majma-'uz-Zawaid)