en_tn/rev/07/03.md

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put a seal on the foreheads

The word "seal" here refers to a mark. This mark shows that the people belong to God and that he will protect them. Alternate translation: "put a mark on the foreheads" (See: rc://en/ta/man/translate/figs-metonymy)

foreheads

The forehead is the top of the face, above the eyes.