Shmita is every 7 years and we leave the land unused. In Egypt there were 7 years of feast, then 7 years of famine. As leaving the land unused could be considered famine like conditions, are there any sources that relate these two?
Shmita is often compared to creation, 7 day:7 years. If this is the case the reverse question can be asked: were the feast and famine periods related to creation?
Or, neither are compared at all and seven is just a oft used number in Torah.