Abu Sinan reported,

Jurayy reported that he came in to see Umar bin Khattab , who had with him a group of the earliest Emigrants. Umar sent for a chest that had been brought to him from a fortress in Iraq, and in it was a ring. One of his sons took the ring and put it in his mouth, but Umar snatched it from him.Then Umar wept.Those present asked him, "Why do you weep? Allah has granted you victory, made you triumph over your enemy, and brought delight to your eye."Umar replied, "I heard the Messenger of Allah ﷺ say, 'Worldly riches are not opened up to any people without Allah casting enmity and hatred among them until the Day of Resurrection,' and I fear that for us."

حدثنا حسن قال حدثنا ابن لهيعة حدثنا أبو الأسود أنه سمع محمد بن عبد الرحمن ابن لبيبة يحدث

عن أبي سنان الدؤلي

أنه دخل على عمر بن الخطاب رضي الله عنه وعنده نفر من المهاجرين الأولين فأرسل عمر إلى سفط أتي به من قلعة من العراق فكان فيه خاتم فأخذه بعض بنيه فأدخله في فيه فانتزعه عمر منه ثم بكى عمر رضي الله عنه فقال له من عنده لم تبكي وقد فتح الله لك وأظهرك على عدوك وأقر عينك فقال عمر رضي الله عنه إني سمعت رسول الله ﷺ يقول لا تفتح الدنيا على أحد إلا ألقى الله عز وجل بينهم العداوة والبغضاء إلى يوم القيامة وأنا أشفق من ذلك