Leviticus 27:28

Notwithstanding, nothing set apart, that a man shall set apart to LORD of all that he has, whether of man or beast, or of the field of his possession, shall be sold or redeemed; everything set apart is most holy to LORD.

Exodus 22:29

Thou shall not delay to offer from thy harvest, and from the outflow of thy presses. The first-born of thy sons thou shall give to me.

Leviticus 23:20

And the priest shall wave them with the bread of the first-fruits for a wave-offering before LORD, with the two lambs. They shall be holy to LORD for the priest.

Leviticus 25:34

But the field of the suburbs of their cities may not be sold, for it is their perpetual possession.

Leviticus 27:9-10

And if it be a beast, of which men offer an oblation to LORD, all that any man gives of such to LORD shall be holy.

Leviticus 27:32-33

And all the tithe of the herd or the flock, whatever passes under the rod, the tenth shall be holy to LORD.

Malachi 3:8-10

Will a man rob God? Yet ye rob me. But ye say, How have we robbed thee? In tithes and offerings.

Treasury of Scripture Knowledge

Summary

And they shall not sell of it, neither exchange, nor alienate the firstfruits of the land: for it is holy unto the LORD.

Bible References

They shall

Exodus 22:29
Thou shall not delay to offer from thy harvest, and from the outflow of thy presses. The first-born of thy sons thou shall give to me.
Leviticus 27:10
He shall not alter it, nor change it, a good for a bad, or a bad for a good. And if he shall at all change beast for beast, then both it and that for which it is changed shall be holy.

For

Leviticus 23:20
And the priest shall wave them with the bread of the first-fruits for a wave-offering before LORD, with the two lambs. They shall be holy to LORD for the priest.
Leviticus 27:9
And if it be a beast, of which men offer an oblation to LORD, all that any man gives of such to LORD shall be holy.
Malachi 3:8
Will a man rob God? Yet ye rob me. But ye say, How have we robbed thee? In tithes and offerings.