Beside the sabbaths of the LORD, and beside your gifts, and beside all your vows, and beside all your freewill offerings, which ye give unto the LORD.

Wesley's Notes

23:38 Beside the sabbaths - The offerings of the weekly sabbaths. God will not have any sabbath - sacrifice diminished because of the addition of others, proper to any other feast. And it is here to be noted, that though other festival days are sometimes called sabbaths, yet these are here called the sabbaths of the Lord, in way of contradistinction, to shew that this was more eminently such than other feast - days. Your gifts - Which being here distinguished from the free - will - offerings made to the Lord, may note what they freely gave to the priests over and above their first - fruits and tithes or other things which they were enjoined to give.

Matthew Henry's Concise Commentary

23:33-44 In the feast of Tabernacles there was a remembrance of their dwelling in tents, or booths, in the wilderness, as well as their fathers dwelling in tents in Canaan; to remind them of their origin and their deliverance. Christ's tabernacling on earth in human nature, might also be prefigured. And it represents the believer's life on earth: a stranger and pilgrim here below, his home and heart are above with his Saviour. They would the more value the comforts and conveniences of their own houses, when they had been seven days dwelling in the booths. It is good for those who have ease and plenty, sometimes to learn what it is to endure hardness. The joy of harvest ought to be improved for the furtherance of our joy in God. The earth is the Lord's, and the fullness thereof; therefore whatever we have the comfort of, he must have the glory of, especially when any mercy is perfected. God appointed these feasts, Beside the sabbaths and your free-will offerings. Calls to extraordinary services will not excuse from constant and stated ones.