Exodus 22:28

מלאתך [THOU SHALT NOT DELAY TO OFFER FROM] THY FULLNESS — The duty which falls upon you as soon as your crop becomes fully ripened: this refers to the first fruits (בכורים). ודמעך means THE HEAVE OFFERING, — thus do our Rabbis explain it (cf. Mekhilta), but I do not know what the expression דמע means (i. e. I do not know how it comes to have the meaning of (תרומה). לא תאחר THOU SHALT NOT DELAY — i. e. thou shalt not alter the prescribed sequence of separating them from the crops, setting aside last what should be first and setting aside first what should be last — i. e. that one should not set aside the heave-offering before the first fruit nor the tithe before the heave-offering (Mekhilta). בכור בניך תתן לי THE FIRST BORN OF THY SONS SHALT THOU GIVE UNTO ME — by redeeming him from the priest by the payment of five Sela’im. Scripture, it is true, has already given an ordinance concerning him (the firstborn) in another passage (Numbers 18:16), but it is stated here again in order to bring it into juxtaposition with the next verse: “Likewise shalt thou do with that of thine ox”, and to illustrate the latter command by the former. How is it in the case of a human being? He (the father) redeems it after thirty days, for it is said, (Numbers 18:16) “and those that are to be redeemed, from a month old shalt thou redeem”! So, too, has the owner of small cattle to look after it for 30 days and only afterwards must he give it to the priest (cf. Mekhilta and Bekhorot 26b).

מְלֵאָתְךָ֥ וְדִמְעֲךָ֖ לֹ֣א תְאַחֵ֑ר בְּכ֥וֹר בָּנֶ֖יךָ תִּתֶּן־לִֽי׃

Thou shalt not delay to offer the first of thy ripe fruits, and of thy liquors: the firstborn of thy sons shalt thou give to me.