Numbers 5:10

ואיש את קדשיו לו יהיו AND EVERY MAN’S HOLY THINGS SHALL BE HIS — Because the gifts due to the priests and the Levites are merely mentioned in the Torah (Deuteronomy 18:1—8) (without any statement as to how they are to come into possession of them), therefore one might think they may come and take them by force. On this account, it states here, ‘‘and every man’s holy things shall be his” — in some respect — thus it teaches us that the טובת הנאה, the gratification of using them in this respect as he wishes, belongs to the owner. — Many other Halachic rules have they (the Rabbis) deduced about it (this statement) in Sifrei Bamidbar 6:2. — An Agadic explanation of ואיש את קדשיו לו יהיו is the following: Whosoever retains the tithes and does not give them to the Levite, only the tithes will be his, i.e., his field will ultimately yield no more than a tithe of what it was accustomed to yield (so that his whole possession will not exceed the gifts he should have given to the priests and the Levites; cf. Midrash Tanchuma, Re'eh 10). איש אשר יתן לכהן, A MAN, HOWEVER, WHO GIVES TO THE PRIEST the gifts that are due to him, לו יהיה HE SHALL HAVE great riches (Berakhot 63a).

וְאִ֥ישׁ אֶת־קֳדָשָׁ֖יו ל֣וֹ יִהְי֑וּ אִ֛ישׁ אֲשֶׁר־יִתֵּ֥ן לַכֹּהֵ֖ן ל֥וֹ יִהְיֶֽה׃ {פ}

And every man’s hallowed things shall be his: whatever any man gives the priest, it shall be his.