Musnad Abu Ya'la al-Mawsili 153:128

And from his father, he said: A man saw that it was such and such a night of the ten, meaning the Night of Decree (Laylat al-Qadr). The Prophet, may Allah bless him and grant him peace, said to them: "I see that your visions have concurred that it is in the last ten nights, so seek it in the last ten nights, in the odd-numbered ones among them."