Ata' said: It used to be said: The two parties return the excess to each other.
Al-Harith al-A'war, al-Hajjaj bin Artah and Ma'mar bin Sulayman are not used as proof. It has also been narrated from Sayyiduna Ali (may Allah be pleased with him) through a third chain.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الرهن / 11233