And have Taqwa of Him Who created you and the generations of the men of old.
Here he is frightening them with the punishment of Allah Who created them and created their forefathers.
This is like when Musa, peace be upon him, said:
رَبُّكُمْ وَرَبُّ ءَابَأيِكُمُ الاٌّوَّلِينَ
Your Lord and the Lord of your ancient fathers! (26:26)
Ibn Abbas, Mujahid, As-Suddi, Sufyan bin Uyaynah and Abdur-Rahman bin Zayd bin Aslam said:
وَالْجِبِلَّةَ الاْاَوَّلِينَ
(the generations of the men of old) means, He created the early generations. And Ibn Zayd recited:
وَلَقَدْ أَضَلَّ مِنْكُمْ جِبِلًّ كَثِيراً
And indeed he (Shaytan) did lead astray a great multitude of you. (36:62)