(18) باب صَلاَةِ الْعِشَاءِ وَالْفَجْرِ فِي جَمَاعَةٍ
It was narrated that Abu Hurairah said:
"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.'"
Reference: Sunan Ibn Majah 797
In-book reference: Book 4, Hadith 63
English translation: Vol. 1, Book 4, Hadith 797