The Prophet [SAW] was asked about mead and he said: "Every drink that intoxicates is unlawful." And mead is a drink made of honey.
أَنَّ رَسُولَ اللَّهِ ﷺ سُئِلَ عَنِ الْبِتْعِ فَقَالَ كُلُّ شَرَابٍ أَسْكَرَ فَهُوَ حَرَامٌ وَالْبِتْعُ هُوَ نَبِيذُ الْعَسَلِ