ENOfficial
‘Abdallah b. ‘Umar told that he heard God's Messenger say, “He who throws off obedience will meet God on the day of resurrection without possessing any plea, and he who dies without having taken an oath of allegiance will die like a pagan.” Muslim transmitted it.
Source: sunnah.com
Other translations
Arabic
وَعَنْ عَبْدِ اللَّهِ بْنِ عُمَرَ قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسلم يَقُول: «مَنْ خَلَعَ يَدًا مِنْ طَاعَةٍ لَقِيَ اللَّهَ يَوْمَ الْقِيَامَةِ وَلَا حُجَّةَ لَهُ. وَمَنْ مَاتَ وَلَيْسَ فِي عُنُقِهِ بَيْعَةٌ مَاتَ مِيتَةً جَاهِلِيَّةً» . رَوَاهُ مُسلم
sunnah.com