1:7-13 God's day is at hand; the punishment of presumptuous sinners is a sacrifice to the justice of God. The Jewish royal family shall be reckoned with for their pride and vanity; and those that leap on the threshold, invading their neighbours' rights, and seizing their possessions. The trading people and the rich merchants are called to account. Secure and careless people are reckoned with. They are secure and easy; they say in their heart, the Lord will not do good, neither will he do evil; that is, they deny his dispensing rewards and punishments. But in the day of the Lord's judgment, it will clearly appear that those who perish, fall a sacrifice to Divine justice for breaking God's law, and because they have no interest by faith in the Redeemer's atoning sacrifice.
9. those that leap on the threshold—the servants of the princes, who, after having gotten prey (like hounds) for their masters, leap exultingly on their masters' thresholds; or, on the thresholds of the houses which they break into [Calvin]. Jerome explains it of those who walk up the steps into the sanctuary with haughtiness. Rosenmuller translates, "Leap over the threshold"; namely, in imitation of the Philistine custom of not treading on the threshold, which arose from the head and hands of Dragon being broken off on the threshold before the ark (1Sa 5:5). Compare Isa 2:6, "thy people … are soothsayers like the Philistines." Calvin's view agrees best with the latter clause of the verse.
fill … masters' houses with violence, &c.—that is, with goods obtained with violence, &c.