Sayyiduna Abdullah bin Umar (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) said: "Do not sell over one another's sale." In the narration of Abu Zakariyya it is: "He should not sell."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10888