Muwatta Malik, Book 31, Hadith 29 (USC-MSA)

Yahya related to me from Malik from Musa ibn Abi Tamim from Abu'l Hubab Said ibn Yasar from Abu Hurayra that the Messenger of Allah, may Allah bless him and grant him peace, said, "A dinar for a dinar, a dirham for a dirham, no excess between the two."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ مُوسَى بْنِ أَبِي تَمِيمٍ، عَنْ أَبِي الْحُبَابِ، سَعِيدِ بْنِ يَسَارٍ عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ الدِّينَارُ بِالدِّينَارِ وَالدِّرْهَمُ بِالدِّرْهَمِ لاَ فَضْلَ بَيْنَهُمَا ‏" ‏ ‏.‏

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also referenced under: Book 31, Hadith 1320 (In-Book)