Jami At Tirmidhi
1748
Sahih+3

Narrated Anas bin Malik: "The inscription on the ring of the Prophet (ﷺ) was in three line: 'Muhammad' on a line, 'Messenger' on a line, 'Allah' on a line." And Muhammad bin Yahya (one of the two who narrated to him) did not say: "Three lines" in his narration. There are narrations on this topic from Ibn 'Umar. [Abu 'Eisa said:] This Hadith of Anas is a Hasan Sahih Gharib

SahihAhmad Muhammad Shakir
SahihAl-Albani