Sa’id bin Al Musayyab said “The Messenger of Allah(ﷺ) conquered a portion of Khaibar by force.” Abu Dawud said “This tradition was read out to Al Harith bin Miskin while I was a witness”. Ibn Wahb said “Malik told me on the authority of Ibn Shihab, Khaibar was captured by force in part and by peace in part. Most of Al Kutaibah was captured by force and a portion by peace.” I asked Malik “What is Al Kutaibah?” He replied “The land of Khaibar. It had forty thousand palm trees.”
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى بْنِ فَارِسٍ، حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مُحَمَّدٍ، عَنْ جُوَيْرِيَةَ، عَنْ مَالِكٍ، عَنِ الزُّهْرِيِّ، أَنَّ سَعِيدَ بْنَ الْمُسَيَّبِ، أَخْبَرَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم افْتَتَحَ بَعْضَ خَيْبَرَ عَنْوَةً . قَالَ أَبُو دَاوُدَ وَقُرِئَ عَلَى الْحَارِثِ بْنِ مِسْكِينٍ وَأَنَا شَاهِدٌ أَخْبَرَكُمُ ابْنُ وَهْبٍ قَالَ حَدَّثَنِي مَالِكٌ عَنِ ابْنِ شِهَابٍ أَنَّ خَيْبَرَ كَانَ بَعْضُهَا عَنْوَةً وَبَعْضُهَا صُلْحًا وَالْكُتَيْبَةُ أَكْثَرُهَا عَنْوَةً وَفِيهَا صُلْحٌ . قُلْتُ لِمَالِكٍ وَمَا الْكُتَيْبَةُ قَالَ أَرْضُ خَيْبَرَ وَهِيَ أَرْبَعُونَ أَلْفَ عَذْقٍ .
sunnah.com