Mus'ab bin Sa'd (may Allah have mercy on him) says that Sayyiduna 'Umar bin Khattab (may Allah be pleased with him) passed by some people who were practicing archery. He pointed out their weakness, so they said: "O Commander of the Faithful! We are just learning." He said: "The word you have spoken is harsher to us than your poor aim. I heard the Messenger of Allah (peace and blessings be upon him) say: 'May Allah have mercy on the person who corrects his tongue.'"
Hadith Referenceمسند الشهاب / 580
Hadith Gradingمحدثین:إسناده ضعيف جدا
Hadith Takhrij«إسناده ضعيف جدا ، وأخرجه الكامل لابن عدى : 441/6» یحیی ٰبن ہاشم متروک ہے ، اس میں اور بھی علتیں ہیں ۔