It is reported on the authority of Ta'us that a man said to 'Abdullah son of 'Umar (RA) . Why don't you carry out a military expedition? Upon which he replied: I heard the messenger of Allah (ﷺ) say: Verily, al-Islam is founded on five (pillars): testifying the fact that there is no god but Allah, establishment of prayer, payment of Zakat, fast of Ramadan and Pilgrimage to the House.
Hadith Referenceصحيح مسلم / كتاب الإيمان / 16
Hadith Gradingمحدثین:أحاديث صحيح مسلم كلها صحيحة
Hadith Takhrij«أحاديث صحيح مسلم كلها صحيحة ، أخرجه البخاري فى ((صحيحـه)) فى الايمان، باب: دعا وكم ايمانكم برقم (8) والترمذي فى ((جامعه)) فى الايمان، باب: ما جاء بنى الاسلام على خمس برقم (2609) انظر ((التحفة)) برقم (7344) »
Abu Tufail reported: I visited Abu Sariha Hudhaifa bin Usaid al-Ghifari who said: I listened with these two ears of mine Allah's Messenger (ﷺ) as saying: The semen stays in the womb for forty nights, then the angel, gives it a shape. Zubair said: I think that he said: One who fashions that and decides whether he would be male or female. Then he (the angel) says: Would his limbs be full or imperfect? And then the Lord makes them full and perfect or otherwise as He desires. Then he says: My Lord, what about his livelihood, and his death and what about his disposition? And then the Lord decides about his misfortune and fortune.