His saying: "Indeed this is for you a reward, and your striving"—meaning your deeds in the world—"is appreciated," meaning Allah has appreciated it for you; so He rewarded you with Paradise for it.
قَوْلُهُ: ﴿إِنَّ هَذَا كَانَ لَكُمْ جَزَاء وَكَانَ سعيكم﴾ عَمَلكُمْ فِي الدُّنْيَا ﴿مشكورا﴾ شَكَرَهُ اللَّهُ لَكُمْ؛ فَجَزَاكُمْ بِهِ الْجنَّة