Possible meanings are 1) this is a reference to people who did not step on thresholds as part of their worship of a god called Dagan or 2) people who leapt up onto platforms to worship pagan idols or 3) royal officials who climbed the steps to the throne.
# fill their master's house with violence and deceit
The abstract nouns "violence" and "deceit" can be stated as actions. Alternate translation: "those who do violent things and tell lies in the temples of their gods"