Allah says, `He sent Messengers to the nations of the past, and they were rejected. You, O Muhammad, have an example in your brothers among the Messengers, so do not be distressed by your people's rejection. As for the idolators' rejection of the Messengers, the reason for this is that the Shaytan made their deeds attractive to them.'

[فَهُوَ وَلِيُّهُمُ الْيَوْمَ]

(So today he (Shaytan) is their helper,) meaning they will be suffering punishment while Shaytan is their only helper, and he cannot save them, so they have no one to answer their calls for help, and theirs is a painful punishment.