John Gill Commentary Leviticus 19:24

"But in the fourth year all the fruit thereof shall be holy, for giving praise unto Jehovah." — Leviticus 19:24 (ASV)

But in the fourth year all the fruit of it shall be holy , &c.] Separated and devoted to the service of God, to be given to the priest, or to be bought again of him; therefore the Targum of Jonathan adds, at the end of the verse, "redeemed from the priest", a redemption price being given to the priest; and, as Jarchi observes, as the tithe was not eaten without the walls of Jerusalem, but by redemption, even so likewise this.

to praise the Lord [with] ; for his abundant goodness in blessing and making the trees fruitful, and bringing their fruit unto perfection; and by devoting the first fruits to God, his name was praised and glorified, as well as by eating them with joy and gladness before the Lord in Jerusalem.