" قَدِ اصْطَنَعْنَا خَاتَمًا وَنَقَشْنَا عَلَيْهِ نَقْشًا فَلاَ يَنْقُشْ عَلَيْهِ أَحَدٌ "
It was narrated that Anas said: "The Messenger of Allah [SAW] said: 'We have had a ring made with an inscription, and no one else should copy this inscription.'"