Fiqh-us-Sunnah Volume 4, Funerals and Dhikr, Fiqh 4.131.
Section : When One is Confronted with a Difficult Situation.
Anas reported that the Prophet, peace be upon him, used to supplicate, “O Allah, there is no ease except what You make easy, and you alone can turn a difficulty into ease.” (Ibn As-sinni)