It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When Allah Almighty created the earth, it began to quake and sway, so Allah created the mountains and set them firmly upon the earth, and it became stable. The angels were greatly amazed at this (mighty) creation of the mountains. They said: 'O my Lord! Is there anything among Your creation that is stronger than the mountains?' Allah Almighty said: 'Yes, iron.' They said again: 'O my Lord! Is there anything among Your creation that is stronger than iron?' Allah Almighty said: 'Yes, fire.' The angels asked: 'O my Lord! Is there anything among Your creation that is stronger than fire?' Allah Almighty said: 'Yes, water.' They said: 'O my Lord! Is there anything among Your creation that is stronger than water?' Allah Almighty said: 'Yes, wind.' They said again: 'O my Lord! Is there anything among Your creation that is stronger than wind?' Allah Almighty said: 'Yes, the human being who gives charity with his right hand and conceals it even from his left hand (so much that it does not even know of it).'"
Hadith Referenceمسند أبي يعلى الموصلي / مسند أنس بن مالك / 4310
Hadith Takhrij«قال سعيد بن محمد السناري: ضعيف» «أخرجه سنن الترمذي برقم: 3369، وأخرجه مسند أحمد برقم: 11844، وأخرجه فتح الباري برقم: 629، 4430، وأخرجه الأحاديث المختارة برقم: 2148، مسند ابویعلیٰ ترقیم الاثری: 4294»