Sa'id bin Abi 'Aruba سعيد بن أبي عروبة · The Book on Clothing

"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. This Hadith of Anas is a Hasan Sahih Gharib.