"High Sabbaths" were weekly Sabbaths (Saturdays) that occurred during a festival week.
The 1st and 7th days of festival weeks were also sabbaths, but they were lesser sabbaths. The reason is that the Law allowed certain work to be done on these festival sabbaths, the work that was necessary to prepare the feast for that day (Exodus 12:16). So these sabbaths were less strict, ergo they were "lesser" or "smaller" sabbaths.
However, the law was much more strict about the weekly Sabbath law, that no work of any kind could be done, not even to prepare the feast on a feast day, thus it was a "High Sabbath" because the Sabbath commandment superseded (was higher than) the festival commandments. So on the Preparation (Friday) of a festival week, enough food had to be prepared for 2 days and the people had to rest from all work on the weekly Sabbath.
In Christ,
Pilgrimer
The day after Passover is 1st Day of Unleavened Bread which is a High Sabbath not a normal weekly;y sabbath.. There where 7 days of unleavened bread and the first and last days where both High Sabbaths.. So there where two sabbaths during the week of the execution of the LORD Jesus Christ.. One started on Wednesday sunset and ended on Thursday sunset and the second started on Friday sunset and ended on Saturday sunset..