Leviticus 27:31

29 None devoted, which shall be devoted of men, shall be redeemed; but shall surely be put to death.

30 And all the tithe of the land, whether of the seed of the land, or of the fruit of the tree, is the LORD’s: it is holy unto the LORD.

And if a man will at all redeem ought of his tithes, he shall add thereto the fifth part thereof.

32 And concerning the tithe of the herd, or of the flock, even of whatsoever passeth under the rod, the tenth shall be holy unto the LORD.

33 He shall not search whether it be good or bad, neither shall he change it: and if he change it at all, then both it and the change thereof shall be holy; it shall not be redeemed.

This was said to Israel at a particular time, so it is wise to read it together with the surrounding text. Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB
If a man wishes to redeem part of his tithe, he must add a fifth to its value.
KJV
And if a man will at all redeem ought of his tithes, he shall add thereto the fifth part thereof.
WEB
If a man redeems anything of his tithe, he shall add a fifth part to it.
ASV
And if a man will redeem aught of his tithe, he shall add unto it the fifth part thereof.
DARBY
And if any one will at all redeem of his tithes, he shall add thereto the fifth thereof.
BLB
And if a man really redeems of his tithes, he shall add a fifth to it.
ÅB
Vil noen innløse noe av sin tiende, da skal han legge femtedelen til.
OTB
Hvis noen ønsker å innløse noe av sitt tiende, må de legge til en femtedel til verdien.
B1930
Vil nogen innløse noget av sin tiende, da skal han legge femtedelen til.

Study notes (Tyndale)

Original text and word study