A covenant with God carries immense weight, and abandoning it guarantees a severe and swift reaction. The very moment the people break the agreement that God commanded, they set their own punishment into motion. This betrayal is not an abstract concept; it is defined by the practical actions of following, serving, and bowing down to other gods.
The commentators explain that engaging in these practices will directly awaken God's anger. The immediate result of this anger will be a rapid expulsion, causing the people to quickly lose the good land that had been given to them.