Halakha Keluaran 22:28: Sefer HaChinukh & Mishneh Torah, Negative Mitzvot

To not skip in the laws of produce: To not skip in the laws of produce — some of them over [others] of them — but we should rather extract them in order. The elucidation of the matter is that after the wheat is threshed and cleaned, it is tevel, and the understanding of tevel is produce that has not been separated. And the obligation upon us with it, is to first remove the priestly tithe from it. And by Torah writ, even one [kernel of] wheat exempts the threshing floor (Kiddushin 29b), but the Sages said that [the mandatory amount] is one part in fifty. And afterwards, the obligation upon us from that which is left over is to remove the tithe from it, and that is called the first tithe. And afterwards, the obligation upon us from that which is left over is to remove another tithe, and that is the second tithe. And the priestly tithe is given to the priest, the first tithe to the Levite, and the second tithe [is kept,] that it be eaten by its owner in Jerusalem. And we are obligated to separate these portions from the produce in this order. And upon this came the preventing, that we not do first from this what is fitting to delay, and not delay what is fitting to do first (Mishnah Terumot 3:10) — as it is stated (Exodus 22:28), “Your fullness and your offering you shall not delay.” And it is as if it stated, “From your fullness and your offering, you shall not delay what is fitting to do first.”

Not to separate from the produce the heave-offerings (given to the priest), before the first-fruits, nor the first tithe before the heave-offering, nor the second tithe before the first tithe (Levites’ dues); but the separation should proceed in the due order; first-fruits at the beginning, then the great heave-offering, then the first tithe, and last the second tithe, as it is said, “Thou shalt not delay the first of thy ripe fruits, and of thy liquors” (Ex. 22:28); that is to say, not to defer the offering which should be brought earlier.

That a priest shall not take a harlot in marriage, as it is said, “They shall not take a wife that is a harlot” (Lev. 21:7).