Ambassador

In the Old Testament the Hebrew word "tsir", meaning "one who
goes on an errand," is rendered thus (Josh. 9:4; Prov. 13:17;
Isa. 18:2; Jer. 49:14; Obad. 1:1). This is also the rendering of
"melits", meaning "an interpreter," in 2 Chr. 32:31; and of
"malak", a "messenger," in 2 Chr. 35:21; Isa. 30:4; 33:7; Ezek.
17:15. This is the name used by the apostle as designating those
who are appointed by God to declare his will (2 Cor. 5:20; Eph.
6:20).

The Hebrews on various occasions and for various purposes had
recourse to the services of ambassadors, e.g., to contract
alliances (Josh. 9:4), to solicit favours (Num. 20:14), to
remonstrate when wrong was done (Judg. 11:12), to condole with a
young king on the death of his father (2 Sam. 10:2), and to
congratulate a king on his accession to the throne (1 Kings
5:1).

To do injury to an ambassador was to insult the king who sent
him (2 Sam. 10:5).