Hadith
حَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، أَخْبَرَنَا عَاصِمٌ الأَحْوَلُ، قَالَ سَأَلْتُ أَنَسًا أَحَرَّمَ رَسُولُ اللَّهِ صلى الله عليه وسلم الْمَدِينَةَ قَالَ نَعَمْ هِيَ حَرَامٌ لاَ يُخْتَلَى خَلاَهَا فَمَنْ فَعَلَ ذَلِكَ فَعَلَيْهِ لَعْنَةُ اللَّهِ وَالْمَلاَئِكَةِ وَالنَّاسِ أَجْمَعِينَ .
Asim reported:I asked Anas (Allah be pleased with him) whether Allah's Messenger (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
Sahih
Sahih Muslim 3324 ·Book 15, Hadith 528·Also available on sunnah.com·