Sunan Ibn Majah, Book 1, Hadith 108 (In-Book) ⓘ
It was narrated that Ibn 'Abbas said: "When 'Umar became Muslim, Jibril came down and said: 'O Muhammed! The people of heaven are rejoicing because of 'Umar's Islam.'"
حَدَّثَنَا إِسْمَاعِيلُ بْنُ مُحَمَّدٍ الطَّلْحِيُّ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ خِرَاشٍ الْحَوْشَبِيُّ، عَنِ الْعَوَّامِ بْنِ حَوْشَبٍ، عَنْ مُجَاهِدٍ، عَنِ ابْنِ عَبَّاسٍ، قَالَ لَمَّا أَسْلَمَ عُمَرُ نَزَلَ جِبْرِيلُ فَقَالَ يَا مُحَمَّدُ لَقَدِ اسْتَبْشَرَ أَهْلُ السَّمَاءِ بِإِسْلاَمِ عُمَرَ .
also referenced under: Hadith 103 (Reference) & Volume 1, Book 1, Hadith 103 (DarusSalam)