High Sabbaths
High Sabbaths, in most Christian and Messianic Jewish usage, are seven annual biblical festivals and rest days, recorded in the books of Leviticus and Deuteronomy. This is an extension of the term "high day" found in the King James Version at.
Biblical rest days
The seven festivals do not necessarily occur on weekly Shabbat and are called by the name miqra in Hebrew. They are observed by Jews and a minority of Christians. Two of the shabbath occur in spring on the first and last day of the Feast of unleavened bread. One occurs in the summer, this is the Feast of Weeks. And four occur in the fall in the seventh month. Feast of Trumpets on the first day of the seventh month; the second is the Day of Atonement ; and two during the Feast of Tabernacles on the first and last day. Sometimes the word shabbaton is extended to mean all seven festivals.The Gospel of John says of the day beginning following Christ's death, "that sabbath day was a high day". That night was Nisan 15, just after the first day of Passover week and an annual miqra and rest day, in most chronologies. The King James Version may thus be the origin of naming the annual rest days "High Sabbaths" in English.