Usul16

Using Local Measuring Tools Is the only Valid Tools

alkafi-8803Vol. 5, p. 184

لَا يَحِلُّ لِلرَّجُلِ أَنْ يَبِيعَ بِصَاعٍ سِوَى صَاعِ أَهْلِ الْمِصْرِ فَإِنَّ الرَّجُلَ يَسْتَأْجِرُ الْجَمَّالَ فَيَكِيلُ لَهُ بِمُدِّ بَيْتِهِ لَعَلَّهُ يَكُونُ أَصْغَرَ مِنْ مُدِّ السُّوقِ وَ لَوْ قَالَ هَذَا أَصْغَرُ مِنْ مُدِّ السُّوقِ لَمْ يَأْخُذْ بِهِ وَ لَكِنَّهُ يَحْمِلُ ذَلِكَ وَ يَجْعَلُ فِي أَمَانَتِهِ‌[1] وَ قَالَ لَا يَصْلُحُ إِلَّا مُدٌّ وَاحِدٌ وَ الْأَمْنَاءُ بِهَذِهِ الْمَنْزِلَةِ.

‘It is not lawful for one to sell with a Sa‘ which is not in use in a city. A man may hire a camel man and measures with a device of his home which perhaps is smaller than the mud (a certain measurement) of the market- place. If he says it is smaller than the mud of the market he does not accept unless he guarantees an

alkafi-8804Vol. 5, p. 184

سَأَلْتُهُ عَنْ قَوْمٍ يُصَغِّرُونَ الْقُفْزَانَ يَبِيعُونَ بِهَا قَالَ أُولَئِكَ الَّذِينَ يَبْخَسُونَ‌ النَّاسَ أَشْياءَهُمْ*.

“I once asked abu al-Hassan (a.s.), about a people who make al-Qufzan (measuring devices) small with which they sell. He (the Imam) said, ‘They are of the people who cause losses in their belongings.’”