Is Land Included If A Person Vows To Give Up Wealth?

It was narrated that Abu Hurairah said:

"We were with the Messenger of Allah in the year of Khaibar, and we did not get any spoils of war except for wealth, goods and clothes. Then a man from Banu Ad-Dubaib, who was called Rifa'ah bin Zaid, gave the Messenger of Allah a black slave who was called Mid'am. The Messenger of Allah set out for Wadi Al-Qura. When we were in Wadi Al-Qura, while Mid'am was unloading the luggage of the Messenger of Allah, an arrow came and killed him. The people said: 'Congratulations! You will go to Paradise,' but the Messenger of Allah said: 'No, by the One in Whose hand is my soul! The cloak that he took from the spoils of war on the Day of Khaibar is burning him with fire.' When the people heard that, a man brought one or two shoelaces to the Messenger of Allah and the Messenger of Allah said: 'One or two shoelaces of fire.'"

قَالَ الْحَارِثُ بْنُ مِسْكِينٍ قِرَاءَةً عَلَيْهِ وَأَنَا أَسْمَعُ، عَنِ ابْنِ الْقَاسِمِ، قَالَ حَدَّثَنِي مَالِكٌ، عَنْ ثَوْرِ بْنِ زَيْدٍ، عَنْ أَبِي الْغَيْثِ، مَوْلَى ابْنِ مُطِيعٍ عَنْ أَبِي هُرَيْرَةَ، قَالَ كُنَّا مَعَ رَسُولِ اللَّهِ ﷺ عَامَ خَيْبَرَ فَلَمْ نَغْنَمْ إِلاَّ الأَمْوَالَ وَالْمَتَاعَ وَالثِّيَابَ فَأَهْدَى رَجُلٌ مِنْ بَنِي الضُّبَيْبِ يُقَالُ لَهُ رِفَاعَةُ بْنُ زَيْدٍ لِرَسُولِ اللَّهِ ﷺ غُلاَمًا أَسْوَدَ يُقَالُ لَهُ مِدْعَمٌ فَوُجِّهَ رَسُولُ اللَّهِ ﷺ إِلَى وَادِي الْقُرَى حَتَّى إِذَا كُنَّا بِوَادِي الْقُرَى بَيْنَا مِدْعَمٌ يَحُطُّ رَحْلَ رَسُولِ اللَّهِ ﷺ فَجَاءَهُ سَهْمٌ فَأَصَابَهُ فَقَتَلَهُ فَقَالَ النَّاسُ هَنِيئًا لَكَ الْجَنَّةُ . فَقَالَ رَسُولُ اللَّهِ ﷺ " كَلاَّ وَالَّذِي نَفْسِي بِيَدِهِ إِنَّ الشَّمْلَةَ الَّتِي أَخَذَهَا يَوْمَ خَيْبَرَ مِنَ الْمَغَانِمِ لَتَشْتَعِلُ عَلَيْهِ نَارًا " . فَلَمَّا سَمِعَ النَّاسُ بِذَلِكَ جَاءَ رَجُلٌ بِشِرَاكٍ أَوْ بِشِرَاكَيْنِ إِلَى رَسُولِ اللَّهِ ﷺ فَقَالَ رَسُولُ اللَّهِ ﷺ " شِرَاكٌ أَوْ شِرَاكَانِ مِنْ نَارٍ " .