It is narrated from Sayyiduna Anas bin Malik, may Allah be pleased with him, that the Messenger of Allah ﷺ came out (from his chamber) to us during Ramadan and said: "Laylat al-Qadr was shown to me, but then two men were arguing (I became occupied with their matter), so it was taken away from my memory. Therefore, seek it in the nights of the twenty-ninth, twenty-seventh, and twenty-fifth."
Hadith Referenceالسنن المأثورة / باب صيام من أصبح جنبا / 318
Hadith Takhrijمؤطا امام مالك الاعتكاف، باب ماجاء في ليلة القدر، رقم : 13، مسند احمد : 429/1، رقم : 13452,849 وقال الارنوؤط : اسناده قوى على شرط مسلم