Hadith 101
قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ : " اشْتَدَّ غَضَبُ اللَّهِ عَلَى قَوْمٍ فَعَلُوا بِرَسُولِ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَهُوَ حِينَئِذٍ يُشِيرُ إِلَى رَبَاعِيَتِهِ "
And the Messenger of Allah, peace and blessings be upon him, said: "Allah became extremely angry with the people who did this to His Messenger," while at that time the Messenger of Allah, peace and blessings be upon him, was pointing towards his four blessed front teeth (which had been martyred).