(O Allah, there is no ease except in that which You have made easy, and You make the difficulty, if You wish, easy.)
Ibn Hibban in his Sahih (no. 2427), and Ibn As- Sunni (no. 351). Al-Hafidh (Ibn Hajar) said that this Hadith is authentic. It was also declared authentic by 'Abdul-Qadir Al-Arna'ut in his checking of An-Nawawi's Kitabul-Athkarp. 106.