مختصر صحيح بخاري
Mukhtasar Sahih Bukhari
Book of Laylat al-Qadr
Seeking Laylat al-Qadr in the last ten odd nights.
Sayyiduna Ibn Abbas (may Allah be pleased with them both) in another narration says that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Laylat al-Qadr is in the last ten nights; when nine nights have passed (i.e., the twenty-ninth) or when seven nights remain (i.e., the twenty-third)." By this, he (peace be upon him) meant Laylat al-Qadr.