Sayyiduna Uqbah bin Malik (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) stood on the pulpit in Ramadan and delivered a sermon. He (peace and blessings be upon him) said: "I stood on this pulpit while I knew (which night was) Laylat al-Qadr, so seek it in the odd nights of the last ten."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15053