We found "seal and sign" used in 2 sacred songs, each carrying a unique message of faith.
seal and sign
...I always knew thy name;
I give thee now My seal and sign, seal and sign,
That all may know that thou art Mine, thou art Mine;...
I always knew thy name;
I give thee now My seal and sign, seal and sign,
That all may know that thou art Mine, thou art Mine;
...Long ago;
As the outward seal and sign
Of an inward work divine,...
Long ago;
As the outward seal and sign
Of an inward work divine,
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