3:3 revealing3 that you are a letter of Christ, delivered by us,4 written not with ink but by the Spirit of the living God, not on stone tablets5 but on tablets of human hearts.
tnGrk “cared for by us,” an expression that could refer either to the writing or the delivery of the letter (BDAG229s.v.διακονέω 1). Since the following phrase refers to the writing of the letter, and since the previous verse speaks of this “letter” being “written on our [Paul’s and his companions’] hearts” it is more probable that the phrase “cared for by us” refers to the delivery of the letter (in the person of Paul and his companions).