Musannaf Ibn Abi Shayba 4:660

9526. 'Abd al-A'la and Ibn Numayr narrated to us, from Muhammad ibn Ishaq, from Yazid ibn Abi Habib, from Marthad ibn 'Abd Allah al-Yazani, from al-Sunabih, who said: I asked Bilal about the Night of Decree (Laylat al-Qadr), and he said: "The night of the twenty-third."