[So travel with My servants by night, for you will be followed] meaning: Pharaoh and his soldiers will follow you.
﴿فَأَسْرِ بِعِبَادِي لَيْلا إِنَّكُمْ مُتَّبَعُونَ﴾ أَي: يتبعكم فِرْعَوْن وَجُنُوده