Musannaf Ibn Abi Shayba 3:6302

Waki’ narrated to us, he said: ‘Umar ibn Shaybah ibn Qāriz narrated to us, he said: I heard Abū Bakr ibn ‘Abd al-Raḥmān ibn al-Ḥārith ibn Hishām saying: The Night of Decree (Laylat al-Qadr) is the night of the seventeenth, the night of Friday.