"The Messenger of Allah said: 'The most burdensome prayers for the hypocrites are the 'Isha' prayer and the Fajr prayer. If only they knew what (reward) there is in them, they would come to them even if they had to crawl.'" (Using translation from Ibn Mājah 797)
قَالَ رَسُولُ اللَّهِ ﷺ «إِنَّهُ لَيْسَ مِنْ صَلَاةٍ أَثْقَلُ عَلَى الْمُنَافِقِينَ مِنْ صَلَاةِ الْعِشَاءِ الْآخِرَةِ وَصَلَاةِ الْفَجْرِ وَلَوْ يَعْلَمُونَ مَا فِيهِمَا لَأَتَوْهُمَا وَلَوْ حَبْوًا»