١٠ـ يُونُسُ عَنْ مُثَنًّى عَنْ أَبِي بَصِيرٍ قَالَ سَمِعْتُ أَبَا جَعْفَرٍ (عَلَيهِ السَّلام) يَقُولُ كَانَ أَبُو ذَرٍّ رَحِمَهُ الله يَقُولُ يَا مُبْتَغِيَ الْعِلْمِ إِنَّ هَذَا اللِّسَانَ مِفْتَاحُ خَيْرٍ وَمِفْتَاحُ شَرٍّ فَاخْتِمْ عَلَى لِسَانِكَ كَمَا تَخْتِمُ عَلَى ذَهَبِكَ وَوَرِقِكَ.
10. Yunus has narrated from Muthanna from abu Basir who has said the following: “I heard abu Ja’far  saying, abu Dhar may Allah grant him blessings, would say, ‘O you who seek knowledge, this tongues is the key to both good and evil. Seal your tongue as you would seal your gold and silver.’” 