Imam Al-Nawawi’s Riyad-us-Saliheen
Chapter 239
The Excellence of Worship in the time of Tribulations
1366. Ma`qil bin Yasar (May Allah be pleased with him) reported: The Messenger of Allah (sallallaahu alayhi wa sallam) said, “The reward of worship performed at a time of trials is equal in reward to an emigration to me.”
[Muslim].