John Gill Commentary Leviticus 23:25

"Ye shall do no servile work; and ye shall offer an offering made by fire unto Jehovah." — Leviticus 23:25 (ASV)

You shall do no servile work [therein] Only such as was necessary for dressing food, but not any manual work, such as servants were employed in on other days, as agriculture or any mechanic business:

but you shall offer an offering made by fire to the Lord ; a burnt offering, and what that was may be seen in (Numbers 29:1–6) .