Isaiah 1:14: Your new moons and your appointed festivals my soul hates; they have become a burden to me, I am weary of bearing them.
When God wanted the people to stop and listen, he would give word through the prophets and they would spend time telling the people what God wanted them to know.
When things were going well for the people they would often stop listening or get side-tracked with what they were doing at the time instead of what God was telling them through the prophets.
We now have our bibles and they continue to give us the same words God gave the prophets, but they also tell us what happens when we do not listen!