Sunan an-Nasa'i #4594 · The Book of Financial Transactions

Sunan an-Nasa'iIt was narrated that Ibn 'Umar said
Sunan an-Nasa'i · Book 44 · The Book of Financial Transactions
Sunan an-Nasa'i · كتاب 44 · كتاب البيوع والمعاملات
"The Messenger of Allah said: "Volume is to be measured according to the system of the people of Al-Madinah, and weight is to be measured according to the system of the peole of Makkah."' (Sahih) This is the wording of Ishaq (one of the narrators)
أَخْبَرَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، عَنِ الْمُلاَئِيِّ، عَنْ سُفْيَانَ، ح وَأَنْبَأَنَا مُحَمَّدُ بْنُ إِبْرَاهِيمَ، قَالَ أَنْبَأَنَا أَبُو نُعَيْمٍ، عَنْ سُفْيَانَ، عَنْ حَنْظَلَةَ، عَنْ طَاوُسٍ، عَنِ ابْنِ عُمَرَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏
"‏ الْمِكْيَالُ عَلَى مِكْيَالِ أَهْلِ الْمَدِينَةِ وَالْوَزْنُ عَلَى وَزْنِ أَهْلِ مَكَّةَ ‏"‏ ‏.‏ وَاللَّفْظُ لإِسْحَاقَ ‏.‏
Reference : Sunan an-Nasa'i 4594In-book reference : Book 44, Hadith 146