You have to understand that hospitality is super important in the Middle East culture. It is today and it was in biblical times. So, when Jesus visited his group of friends in the Jerusalem area, there was work to be done. It's quite a group when you have to prepare some food.
The two sisters, Martha and Maria, were very good friends of Jesus. And in this little story (read it in Luke 10:38-42) you are introduced to two very different characters. Watch the story in this Sandy Tale.
Like many stories in the Bible, also this story is some kind of a mirror. What decisions would you make? Can you sympathize with Martha, working hard for a house full of guests and is frustrated because her sister isn't helping? Jesus gives another perspective. About what is temporarily and that what is eternal.