ذَٰلِكُم بِمَا كُنتُمۡ تَفۡرَحُونَ فِي ٱلۡأَرۡضِ بِغَيۡرِ ٱلۡحَقِّ وَبِمَا كُنتُمۡ تَمۡرَحُونَ
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)
Author: Muhammad Taqi Ud Din Al Hilali And Muhammad Muhsin Khan