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Hisn al-Muslim (Fortress of the Muslim) 260
وَقَالَ صلى الله عليه وسلم: ((يَا عَبْدَ اللَّهِ بْنَ قَيْسٍ أَلاَ أَدُلُّكَ عَلَى كَنْزٍ مِنْ كُنُوزِ الْجَنَّةِ))؟ فَقُلْتُ: بَلَى يَا رَسُولَ اللَّهِ، قَالَ: ((قُلْ لاَ حَوْلَ وَلاَ قُوَّةَ إِلاَّ بِاللَّهِ)).
(AAabdullah Ibn Qays related that the Prophet said to him: ‘ O ‘AAabdullah Ibn Qays, shall I not inform you of a treasure from the treasures of paradise?’ He then said: ‘Say: (There is no might nor power except with Allah.))
Cited in Hisn al-Muslim (Fortress of the Muslim) (No. 260).