That was because you had been exulting in the earth without any right (by worshipping others instead of Allah and by committing crimes), and that you used to rejoice extremely (in your error).
اين [عقوبت‌] به سبب آن است كه در زمين به ناروا شادى و سرمستى مى‌كرديد و بدان سبب كه [سخت به خود] مى‌نازيديد