KEEP' The term 'Observe the Sabbath' is a religious commandment found in the Bible, which instructs followers to REST and KEEP holy the seventh day of the week. The crossword solution for this term is 'REST, ' which is a four-letter word that means to take a break from work or activity. This is an appropriate answer to the term 'Observe the Sabbath, ' as it implies taking a break from the usual activities of the week and dedicating the day to worship and REST.