Martha opens up her home for Jesus. She cares so much about him and his followers that she prepares a meal. That’s all good. But Martha’s busyness causes her to miss out on an opportunity to be with Jesus and the others. And Jesus reprimands her for it.
It irks me every time a male pastor preaches this!!! Who else is going to make sure all the company get fed? Martha is probably by herself doing the work while everyone else is listening to and laughing with Jesus. Martha probably doesn't even enjoy the cooking, but usually it's her and Mary spending time together.