Sayyidah Aishah al-Siddiqah (may Allah be pleased with her) narrates: The Prophet (peace and blessings be upon him) said: "When a slave is jointly owned by several people and one of them frees him, the slave will be valued at the highest price; then he will pay his value as a liability (penalty), and the slave will be freed."
Imam al-Tabarani recorded this narration in al-Mu'jam al-Awsat; its chain contains a narrator, al-Muthanna bin al-Sabbah, who is da'if (weak), though he has also been declared trustworthy.
Hadith Referenceمجمع الزوائد ومنبع الفوائد / كتاب العتق / 7291