Charles Ellicott Commentary Leviticus 23:4

"These are the set feasts of Jehovah, even holy convocations, which ye shall proclaim in their appointed season." — Leviticus 23:4 (ASV)

These are the feasts of the Lord. —Because the following are the festivals proper, as distinguished from the sabbath , and because they are now enumerated in their regular order, the introductory heading is here repeated.

Ye shall proclaim in their seasons. —By the blast of trumpets on the day of the month on which they are to be observed.