I asked Anas (Allah be pleased with him) whether Messenger of Allah ﷺ had declared Medina as sacred. He said: Yes, it is sacred, so its tree is not to be cut; and he who did that let the curse of Allah and that of the angels and of all people be upon him.  

سَأَلْتُ أَنَسًا أَحَرَّمَ رَسُولُ اللَّهِ ﷺ الْمَدِينَةَ قَالَ نَعَمْ هِيَ حَرَامٌ لاَ يُخْتَلَى خَلاَهَا فَمَنْ فَعَلَ ذَلِكَ فَعَلَيْهِ لَعْنَةُ اللَّهِ وَالْمَلاَئِكَةِ وَالنَّاسِ أَجْمَعِينَ  

[Machine] I asked Anas ibn Malik, "Did the Messenger of Allah ﷺ declare Medina as a sacred place?" He replied, "Yes, it is forbidden. Allah and His Messenger declared it as such, and it should not be violated. Whoever does so will be condemned by Allah, the angels, and all people." This is the wording of the hadith of Muhammad, and in another narration, the wording is from Ibrahim. Whoever does this act, it is the same for everyone.  

سَأَلْتُ أَنَسَ بْنَ مَالِكٍ أَحَرَّمَ رَسُولُ اللهِ ﷺ الْمَدِينَةَ؟ قَالَ نَعَمْ هِيَ حَرَامٌ حَرَّمَهَا اللهُ وَرَسُولُهُ لَا يُخْتَلَى خَلَاهَا فَمَنْ يَعْمَلْ بِذَلِكَ فَعَلَيْهِ لَعْنَةُ اللهِ وَالْمَلَائِكَةِ وَالنَّاسِ أَجْمَعِينَ لَفْظُ حَدِيثِ مُحَمَّدٍ وَفِي رِوَايَةِ إِبْرَاهِيمَ فَمَنْ فَعَلَ ذَلِكَ وَالْبَاقِي سَوَاءٌ  

"مَنْ تَهَيَّأَ لِلنَّاس بِقَوْلِهِ وَلِبَاسِهِ وَخَالفَ ذَلِكَ في أَعْمَالِهِ فَعَلَيهِ لَعْنَةُ اللهِ والْمَلائِكَةِ وَالنَّاسِ أَجْمَعِينَ".  

" عَنْ عَاصِمٍ الأحْوَلِ قَالَ: سَألتُ أنَس بْنَ مَالِك أحَرَّمَ النَّبِى ﷺ المَدِينَةَ؟ قَالَ: نَعَمْ هِىَ حَرَامٌ، حَرَّمَهَا الله وَرَسُولُهُ، لاَ يُخْتَلَى خَلاَهَا (*)، فَمَنْ فَعَلَ ذَلِكَ فَعَلَيْهِ لَعْنَةُ اللهِ وَالمَلاَئكَةِ وَالناسِ أجْمَعِينَ ".