They well know that prayer at another time than this is more excellent, for Messenger of Allah ﷺ said: The prayer of those who are penitent is observed when your weaned camels feel the heat of the sun. (Using translation from Muslim 748a)
أَنَّ الصَّلَاةَ فِي غَيْرِ هَذِهِ السَّاعَةِ أَفْضَلُ إِنَّ رَسُولَ اللهِ ﷺ قَالَ إِنَّ صَلَاةَ الْأَوَّابِينَ حِينَ تَرْمَضُ الْفِصَالُ