Musnad Ahmad 191
It was narrated from ’Umar that Jibreel عليه السلام said to the Prophet ﷺ:
What is faith (eeman)? He said:“To believe in Allah, His Angels, His Books, His Messengers, the Last Day and the divine decree, both good and bad,” Jibreel said to him: You have spoken the truth. He said: We were amazed that he asked him and then confirmed his answers as being correct. The Prophet ﷺ said: “That was Jībreel, who came to teach you your religion.`
حَدَّثَنَا وَكِيعٌ، حَدَّثَنَا كَهْمَسٌ، عَنِ ابْنِ بُرَيْدَةَ، عَنْ يَحْيَى بْنِ يَعْمَرَ، عَنِ ابْنِ عُمَرَ، أَنَّ جِبْرِيلَ، عَلَيْهِ السَّلَام قَالَ لِلنَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَا الْإِيمَانُ قَالَ أَنْ تُؤْمِنَ بِاللَّهِ وَمَلَائِكَتِهِ وَكُتُبِهِ وَرُسُلِهِ وَالْيَوْمِ الْآخِرِ وَبِالْقَدَرِ خَيْرِهِ وَشَرِّهِ فَقَالَ لَهُ جِبْرِيلُ عَلَيْهِ السَّلَام صَدَقْتَ قَالَ فَتَعَجَّبْنَا مِنْهُ يَسْأَلُهُ وَيُصَدِّقُهُ قَالَ فَقَالَ النَّبِيُّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ذَاكَ جِبْرِيلُ أَتَاكُمْ يُعَلِّمُكُمْ مَعَالِمَ دِينِكُمْ‏.‏