1 Kings 21:8

Sealed them with his seal — with the name, or token, of the king, engraved on stone, and impressed (see Job 38:14) on a lump of clay attached to the letter. The sealing (as the modern sense of “signature” implies) was the pledge of authenticity and authority. (See Genesis 38:18; Nehemiah 9:38; Nehemiah 10:1; Esther 3:10; Esther 3:12; Daniel 6:17, &c.) The use of the seal — ordinarily worn or carried on the person — implies Ahab’s knowledge that something is being done in his name, into which he takes care not to inquire.

In his city. — This would be most naturally interpreted as Jezreel; but if Naboth dwelt or sojourned at Samaria, it may be Samaria. Jezebel naturally desires that neither Ahab nor she herself, though close at hand, should appear in the matter; but gives the necessary authority in writing, because without it the deed could not be done.