Muwatta Malik #1447
Business Transactions
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَحَدَّثَنِي مَالِكٌ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّهُ سَمِعَ سَعِيدَ بْنَ الْمُسَيَّبِ، يَقُولُ إِذَا جِئْتَ أَرْضًا يُوفُونَ الْمِكْيَالَ وَالْمِيزَانَ فَأَطِلِ الْمُقَامَ بِهَا وَإِذَا جِئْتَ أَرْضًا يُنَقِّصُونَ الْمِكْيَالَ وَالْمِيزَانَ فَأَقْلِلِ الْمُقَامَ بِهَا .
Malik related to me that Yahya ibn Said heard Said ibn al-
Musayyab say, "When you come to a land where they give full measure
and full weight, stay there. When you come to a land where they
shorten the measure and weight, then do not stay there very long."
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About Muwatta Malik
This hadith is #1447 from Muwatta Malik, in the Book of Business Transactions.