This verse never caught my attention before today:

Num 28:26 LSV And on the day of the first-fruits, in your bringing a new present near to YHWH, in your weeks, you have a holy convocation; you do no servile work.

I never noticed the first day of the omer count is a holy day, even when I read this verse a few days ago! All these years weve been keeping the feasts as best we know how and totally missed this! It just popped out at me today.