Songs 8:6
Set me as a seal on your heart, as a seal on your arm: for love is strong as death; jealousy is cruel as the grave: the coals thereof are coals of fire, which has a most vehement flame.
Torrey's Topical Textbook—AKJV

Jeremiah 22:24
As I live, said the LORD, though Coniah the son of Jehoiakim king of Judah were the signet on my right hand, yet would I pluck you there;
Torrey's Topical Textbook—AKJV

Haggai 2:23
In that day, said the LORD of hosts, will I take you, O Zerubbabel, my servant, the son of Shealtiel, said the LORD, and will make you as a signet: for I have chosen you, said the LORD of hosts.
Torrey's Topical Textbook—AKJV