Christian people in Korea say "Ansigil jal boneseyo 안식일 잘 보내세요" to each other.

휴일 잘 보내세요. hyuil jal bonaeseyo. 즐거운 휴일 되세요. jeulgeoun hyuil doeseyo. There is no common concept as like "the sabbath" in Korea. Literally 안식일 means "sabbath" though, it is considered as "holiday" or "weekend".