en_tn_lite_do_not_use/1co/09/02.md

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you are the seal of my apostleship in the Lord

The word "seal" here is a metaphor for the evidence needed to prove something. Alternate translation: "you are evidence I can use to prove that the Lord has chosen me to be an apostle" (See: rc://en/ta/man/jit/figs-metaphor)