Numbers 29:39
These things you shall do to the LORD in your set feasts, beside your vows, and your freewill offerings, for your burnt offerings, and for your meat offerings, and for your drink offerings, and for your peace offerings.
Nave's Topical Index—AKJV

Ezra 3:5
And afterward offered the continual burnt offering, both of the new moons, and of all the set feasts of the LORD that were consecrated, and of every one that willingly offered a freewill offering to the LORD.
Nave's Topical Index—AKJV