十八至二十章裡的典章和律例，說到許多事。首先，不可有分於交鬼、拜偶像、佔卜或行巫術（十九4，26，二十2，6，27）。這些典章和律例也說到要有正常人性的生活，諸如：孝敬父母（十九3上，二十9），尊敬老人（十九32），不苛待外人，反要愛他（十九33～34），要有公平的量度和法碼（十九35～36）。
不可說謊或欺騙（十九11），不可欺壓鄰舍（十九13），不可虐待聾子和瞎子（十九14），審判時不可偏袒（十九15），不可隨處搬弄是非（十九16），不可在心裡恨弟兄（十九17）。最重要的是絕不可亂倫。亂倫最破壞人性，這幾章用很長的篇幅專一、詳盡的說到這件事。我們必須在這件事上純潔。
在十八和二十章，有三節說到那地會吐出它的居民（十八25、28，二十22）。二十章二十二節說，『所以你們要謹守並遵行我一切的律例和典章，免得我領你們去住的那地把你們吐出。』美地吐出受玷汙、不聖別的人，表徵那位給我們享受，作我們居所並一切所需之包羅萬有的基督，會把我們從祂口中吐出去（啟三16）。
那地把人吐出去，這事含示了許多。這含示那地是神子民生存與生活的供應，也含示那地是給神子民享受的。人若與那地有正確的關係，就可享受那地。不然，那地會把人吐出去；把人撇棄。這指明我們與我們的美地基督若沒有正確的關係，祂會把我們吐出，不許可我們再享受祂。
The ordinances and statutes in Leviticus 18—20 cover many things. First, we are forbidden to have anything to do with demons, idols, spiritism, and witchcraft (19:4, 26; 20:2, 6, 27). These ordinances and statutes also cover humanity and include such matters as reverencing our mother and father (19:3a; 20:9), respecting aged persons (19:32), not mistreating the alien but instead loving him (19:33-34), having just measures and weights (19:35-36)
Don't lying or deceiving (19:11), not oppressing one’s neighbor (19:13), not mistreating the deaf or the blind (19:14), not being partial in judgment (19:15), not going about as a slanderer (19:16), and not hating our brother in our heart (19:17). The most crucial thing is that we never commit any kind of incest. Incest is the most destructive thing to humanity, and a lengthy section of these chapters is devoted to it in detail. We must be pure in this matter.
Three verses in Leviticus 18 and 20 speak of the land vomiting out its inhabitants (18:25, 28; 20:22). Leviticus 20:22 says, 「You shall therefore keep all My statutes and all My ordinances and do them, that the land where I am bringing you to dwell may not vomit you out.」 The good land vomiting out the defiled and unholy people signifies that the all-inclusive Christ as our dwelling place and everything we need for our enjoyment will vomit us out of Himself (Rev. 3:16).
This matter of the land vomiting out the people implies a great deal. It implies that the land is the supply for the existence and living of God’s people. It also implies that the land is for their enjoyment. If the people are proper with the land, the land will allow them to enjoy it. Otherwise, the land will vomit them out; it will give them up. This indicates that if we are not proper with Christ, who is our good land, He will vomit us out and not allow us to enjoy Him any more.