This story comes from Luke 10 v 38-42. Mary and Martha, and their brother Lazarus, were all friends of Jesus. When Jesus came to visit their home, the two women acted very differently. Mary sat at Jesus’s feet listening to him, but Martha was rushing around getting everything ready for their guest. 

When Martha saw that Mary wasn’t helping, she complained to Jesus, “Lord, don’t you care that my sister has left me to do the work by myself? Tell her to help me!” (v 40, NIV.) But Jesus told her that Mary had made the best choice: “Martha, Martha,” the Lord answered, “you are worried and upset about many things, but few things are needed—or indeed only one. Mary has chosen what is better, and it will not be taken away from her.” (v 41-42, NIV)

Listening to Jesus is always the best thing to do!