It is narrated from Sayyiduna Anas bin Malik, may Allah be pleased with him, who says that the inscription on the ring of the Prophet Muhammad, peace and blessings be upon him, was such that in one line was "Muhammad", in the second line was "Rasul", and in the third line was the word "Allah".
Hadith Referenceشمائل ترمذي / باب ما جاء فى ذكر خاتم رسول الله صلى الله عليه وسلم / 90
Hadith Gradingزبیر علی زئی:صحيح
Hadith Takhrij{ «صحيح» } : « ( سنن ترمذي : 1747 . 1748 ، وقال : حسن صحيح غريب ) ، صحيح بخاري (5878)»