"And you have already known the first creation," meaning: the creation of Adam and his offspring after him. "Then why do you not remember?" meaning: so that you may believe in the Resurrection.
Tafsir of Surat al-Waqi'ah from verse 63 to verse 74.
﴿وَلَقَدْ عَلِمْتُمُ النَّشْأَةَ الأُولَى﴾ خلق آدم وَذريته بعده ﴿فَلَوْلَا﴾ فَهَلا ﴿تَذكَّرُونَ﴾ فتؤمنوا بِالْبَعْثِ.
تَفْسِير سُورَة الْوَاقِعَة من الْآيَة ٦٣ إِلَى الْآيَة ٧٤.