Sahih al-Bukhari, Volume 5, Book 57, Hadith 33 (USC-MSA) ⓘ
Narrated `Abdullah: We have been powerful since `Umar embraced Islam.
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا يَحْيَى، عَنْ إِسْمَاعِيلَ، حَدَّثَنَا قَيْسٌ، قَالَ قَالَ عَبْدُ اللَّهِ مَا زِلْنَا أَعِزَّةً مُنْذُ أَسْلَمَ عُمَرُ.
also referenced under: Book 62, Hadith 34 (In-Book) & Hadith 3684 (DarusSalam)