Yahya related to me from Malik from Ibn Shihab that the Messenger of Allah ﷺ said, "Two deens shall not co-exist in the Arabian Peninsula." Malik said that Ibn Shihab said, ''Umar ibn al-Khattab searched for information about that until he was absolutely convinced that the Messenger of Allah ﷺ had said, 'Two deens shall not co-exist in the Arabian Peninsula,' and he therefore expelled the jews from Khaybar." Malik said, ''Umar ibn al-Khattab expelled the jews from Najran (a jewish settlement in the Yemen) and Fadak (a jewish settlement thirty miles from Madina). When the jews of Khaybar left, they did not take any fruit or land. The jews of Fadak took half the fruit and half the land, because the Messenger of Allah ﷺ had made a settlement with them for that. So Umar entrusted to them the value in gold, silver, camels, ropes and saddle bags of half the fruit and half the land, and handed the value over to them and expelled them."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَجْتَمِعُ دِينَانِ فِي جَزِيرَةِ الْعَرَبِ قَالَ مَالِكٌ قَالَ ابْنُ شِهَابٍ فَفَحَصَ عَنْ ذَلِكَ عُمَرُ بْنُ الْخَطَّابِ حَتَّى أَتَاهُ الثَّلْجُ وَالْيَقِينُ أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ يَجْتَمِعُ دِينَانِ فِي جَزِيرَةِ الْعَرَبِ فَأَجْلَى يَهُودَ خَيْبَرَ قَالَ مَالِكٌ وَقَدْ أَجْلَى عُمَرُ بْنُ الْخَطَّابِ يَهُودَ نَجْرَانَ وَفَدَكَ فَأَمَّا يَهُودُ خَيْبَرَ فَخَرَجُوا مِنْهَا لَيْسَ لَهُمْ مِنَ الثَّمَرِ وَلاَ مِنَ الأَرْضِ شَىْءٌ وَأَمَّا يَهُودُ فَدَكَ فَكَانَ لَهُمْ نِصْفُ الثَّمَرِ وَنِصْفُ الأَرْضِ لأَنَّ رَسُولَ اللَّهِ ﷺ كَانَ صَالَحَهُمْ عَلَى نِصْفِ الثَّمَرِ وَنِصْفِ الأَرْضِ فَأَقَامَ لَهُمْ عُمَرُ نِصْفَ الثَّمَرِ وَنِصْفَ الأَرْضِ قِيمَةً مِنْ ذَهَبٍ وَوَرِقٍ وَإِبِلٍ وَحِبَالٍ وَأَقْتَابٍ ثُمَّ أَعْطَاهُمُ الْقِيمَةَ وَأَجْلاَهُمْ مِنْهَا  

"عن ابن شهاب قال: فحص عمر بن الخطاب حتى أتاه الثَّلَجُ واليقين أن رسول اللَّه ﷺ قال: لا يَجتمع دينان في جزيرة العرب؛ فأجلى عمرُ يهودَ خيبر".