Musnad Ahmad 265:3

Abu Salamah al-Khuza'i narrated to us, he said: 'Abdullah bin Ja'far—meaning al-Makhrami—narrated to us, from Yazid bin al-Had, from Abu Bakr bin Hazm, from 'Abdullah bin Unays, that the Prophet, peace and blessings of Allah be upon him, said to them, when they asked him about a night they were looking for in Ramadan: "The night of the twenty-third."