Sforno on Exodus 23:19/ספורנו על שמות כ״ג:י״ט

1לא תבשל גדי בחלב אמו, do not practice these procedures which the idolaters believe are apt to improve the earth’s productivity. But, on the contrary, ראשית בכורי אדמתך תביא, if you really want to attract G’d’s blessing on your agricultural endeavours you will present G’d with a gift of the very first and finest of your respective crops. (compare Ezekiel 44,30 וראשית בכורי כל, וכל תרומת כל,...להניח ברכה אל ביתך, “all the choice first fruits of every kind, and all the gifts of every kind,- of all your contributions,- shall go to the priests,,,,that a blessing may rest upon your home.”