What does the Bible say about fasting and feasting?

In Mark 2:18-22, Jesus discusses the appropriateness of fasting in relation to His presence among His disciples. He explains that can the children of the bride chamber fast while the bridegroom is with them. As long as they have the bridegroom with them, they cannot fast. This indicates that fasting is not required when there is joy and celebration in the presence of Christ. However, Jesus also foretells a time when He will be taken away, and then His followers will fast in those days, highlighting the difference between moments of joy with Christ and moments of sorrow.