Ziyad related to me from Malik from Hisham ibn Urwa from hisfather that the Messenger of Allah, may Allah bless him and grant himpeace, said, "Search for Laylat al-Qadr in the last ten days ofRamadan." (ES)
USC-MSA web (English) reference: Book 19, Hadith 11 (ES)
Arabic reference (ES): Book 19, Hadith 701 (ES)