And thither ye shall bring your burnt offerings, and your sacrifices, and your tithes, and heave {d} offerings of your hand, and your vows, and your freewill offerings, and the firstlings of your herds and of your flocks:

(d) Meaning, the first fruits.

Wesley's Notes

12:6 Thither bring your burnt - offerings - Which were wisely appropriated to that one place, for the security of the true religion, and for the prevention of idolatry and superstition, which might otherwise more easily have crept in: and to signify that their sacrifices were not accepted for their own worth, but by God's gracious, appointment, and for the sake of God's altar, by which they were sanctified, and for the sake of Christ, whom the altar manifestly represented. Your heave - offerings - That is, your first - fruits, of corn, and wine, and oil, and other fruits. And these are called the heave - offerings of their hand, because the offerer was first to take these into his hands, and to heave them before the Lord, and then to give them to the priest. Your free - will - offerings - Even your voluntary oblations, which were not due by my prescription, but only by your own choice: you may chuse what kind of offering you please to offer, but not the place where you shall offer them.

Matthew Henry's Concise Commentary

12:5-32 The command to bring ALL the sacrifices to the door of the tabernacle, was now explained with reference to the promised land. As to moral service, then, as now, men might pray and worship every where, as they did in their synagogues. The place which God would choose, is said to be the place where he would put his name. It was to be his habitation, where, as King of Israel, he would be found by all who reverently sought him. Now, under the gospel, we have no temple or altar that sanctifies the gift but Christ only: and as to the places of worship, the prophets foretold that in every place the spiritual incense should be offered, Mal 1:11. Our Saviour declared, that those are accepted as true worshippers, who worship God in sincerity and truth, without regard either to this mountain or Jerusalem, Joh 4:21. And a devout Israelite might honour God, keep up communion with him, and obtain mercy from him, though he had no opportunity of bringing a sacrifice to his altar. Work for God should be done with holy joy and cheerfulness. Even children and servants must rejoice before God; the services of religion are to be a pleasure, and not a task or drudgery. It is the duty of people to be kind to their ministers, who teach them well, and set them good examples. As long as we live, we need their assistance, till we come to that world where ordinances will not be needed. Whether we eat or drink, or whatever we do, we are commanded to do all to the glory of God. And we must do all in the name of the Lord Jesus Christ, giving thanks to the Father through him. They must not even inquire into the modes and forms of idolatrous worship. What good would it do them to know those depths of Satan? And our inward satisfaction will be more and more, as we abound in love and good works, which spring from faith and the in-dwelling Spirit of Christ.