Samaria really did sit like a crown. The city was built on a rounded hill rising out of a broad, fertile valley, and from below it looked like a wreath on a head — which is exactly the phrase Isaiah uses: the crown of pride on the head of the fat valley. In 722 BC, after a siege of about three years, Assyria took it and deported the population, and the crown was, in his words, trodden underfoot.
The banquet scene that follows is described without mercy: priests and prophets staggering, reeling in vision, stumbling in judgment, and every table covered with vomit. These were the men who ruled on legal cases and claimed to hear from God.
Then they mock him, and the mockery is preserved in the text. The Hebrew syllables read like nonsense baby talk — order on order, rule on rule, a little here, a little there — as if the prophet talks to grown men the way you talk to a child just weaned. God's answer is that if they will not hear plain Hebrew, they will hear their instruction from foreign lips: the Assyrian language, which to them would sound exactly like nonsense syllables.
The covenant with death is a diplomatic pact — almost certainly the Egyptian alliance — and the leaders' own boast is quoted: we have made lies our refuge and hidden under falsehood. Against it God lays a foundation stone in Zion, tried and precious, and says he will make justice the measuring line and righteousness the level. Those are a mason's tools: a cord stretched to keep a course straight and a weight hung to keep a wall true.
The chapter ends with a farming lesson everyone had lived. A plowman does not plow forever; he plows, then he sows, and each seed gets its own treatment. Dill and cumin are delicate, so they are beaten out with a stick and a rod. Bread grain is tougher, so it goes under the sledge and the cart wheel — but not endlessly, or the flour is ruined. The farmer knows when to stop. He learned it from God.
