“We observed I’tikaf with the Messenger of Allah ﷺ during the middle ten days of Ramadan. He said: ‘I have been shown Lailatul-Qadr, then I was caused to forget it, so seek it in the last ten night, on the odd-numbered nights.’”  

اعْتَكَفْنَا مَعَ رَسُولِ اللَّهِ ﷺ الْعَشْرَ الأَوْسَطَ مِنْ رَمَضَانَ فَقَالَ إِنِّي أُرِيتُ لَيْلَةَ الْقَدْرِ فَأُنْسِيتُهَا فَالْتَمِسُوهَا فِي الْعَشْرِ الأَوَاخِرِ فِي الْوَتْرِ