Leviticus 23:38

Besides the sabbaths of the LORD, and besides your gifts, and besides all your vows, and besides all your freewill offerings, which you give unto the LORD.

Numbers 29:39

These things you shall do unto the LORD in your appointed feasts, besides your vows, and your freewill offerings, for your burnt offerings, and for your grain offerings, and for your drink offerings, and for your peace offerings.

Genesis 2:2-3

And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.

Exodus 20:8-11

Remember the sabbath day, to keep it holy.

Leviticus 19:3

You shall fear every man his mother, and his father, and keep my sabbaths: I am the LORD your God.

Leviticus 23:3

Six days shall work be done: but the seventh day is the sabbath of rest, a holy convocation; you shall do no work on it: it is the sabbath of the LORD in all your dwellings.

Deuteronomy 12:6

And there you shall bring your burnt offerings, and your sacrifices, and your tithes, and heave offerings of your hand, and your vowed offerings, and your freewill offerings, and the firstlings of your herds and of your flocks:

1 Chronicles 29:3-8

Moreover, because I have set my affection on the house of my God, I have of my own things, of gold and silver, which I have given to the house of my God, over and above all that I have prepared for the holy house,

2 Chronicles 35:7-8

And Josiah gave to the people, from the flock, lambs and kids, all for the passover offerings, for all that were present, to the number of thirty thousand, and three thousand bullocks: these were of the king's possessions.

Ezra 2:68-69

And some of the heads of the fathers' houses, when they came to the house of the LORD which is at Jerusalem, offered freely for the house of God to set it up in its place:

Treasury of Scripture Knowledge

Summary

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.

Bible References

The sabbaths

Leviticus 23:3
Six days shall work be done: but the seventh day is the sabbath of rest, a holy convocation; you shall do no work on it: it is the sabbath of the LORD in all your dwellings.
Leviticus 19:3
You shall fear every man his mother, and his father, and keep my sabbaths: I am the LORD your God.
Genesis 2:2
And on the seventh day God ended his work which he had made; and he rested on the seventh day from all his work which he had made.
Exodus 20:8
Remember the sabbath day, to keep it holy.

And beside

Numbers 29:39
These things you shall do unto the LORD in your appointed feasts, besides your vows, and your freewill offerings, for your burnt offerings, and for your grain offerings, and for your drink offerings, and for your peace offerings.
Deuteronomy 12:6
And there you shall bring your burnt offerings, and your sacrifices, and your tithes, and heave offerings of your hand, and your vowed offerings, and your freewill offerings, and the firstlings of your herds and of your flocks:
1 Chronicles 29:3
Moreover, because I have set my affection on the house of my God, I have of my own things, of gold and silver, which I have given to the house of my God, over and above all that I have prepared for the holy house,
2 Chronicles 35:7
And Josiah gave to the people, from the flock, lambs and kids, all for the passover offerings, for all that were present, to the number of thirty thousand, and three thousand bullocks: these were of the king's possessions.
Ezra 2:68
And some of the heads of the fathers' houses, when they came to the house of the LORD which is at Jerusalem, offered freely for the house of God to set it up in its place: