從十一章到十五章所揭櫫的律法是關於動物、生產、痲瘋和漏症等等所造成的不潔。一個聖潔的人需要聖潔的生活，潔淨之禮雖然會限制一個人的行動自由，但也是敬拜這位聖潔上帝所不可缺少的一環，對以色列來說，這就是飲食規則、健康條件以及接觸到潛伏著不潔之物的檢疫法。「不潔」這個字在這幾章裡出現的次數超過一百次，足見「不潔」（其實就是不順服）在上帝眼中絕非可以等閒視之的小事。

        規則與限制當然使人覺得不舒服！就像看到一個牌子說：「油漆未乾，請勿觸碰」，會讓我們有幾分懊惱，還有諸如：「勿踐踏草地」或「請勿餵食非洲猩猩」或「限制六十五公里」這些似乎都在你耳邊說：「我諒你不敢……」
        然而你是否靜下來想一想，為什麼要有這些規則？那是有想要引起你及別人的注意，他們當然明白新刷的油漆在公園的椅子上一定比黏在你的長褲上漂亮得多；食物吃得不對時，黑猩猩絕不會長得好；至於汽車（其實人也是）若能在安全得情況下駕駛，可以使用得長久一點。
        同理，以色列的律法也是如此，上帝要保護祂的子民，如此那些專吃腐屍的動物就不會上你的餐桌；如果不接觸痲瘋病患，就不必沐浴那麼多次！上帝保護百姓的方式可從祂頒布的律法之中窺探一、二。本日經文足以說明為什麼上帝對以色列人會如此斬釘截鐵的命令。今天，祂對你有同樣的期盼！

        痲瘋今昔觀
        今日的痲瘋病（如跛足和畸形）與利未記或新約所說的痲瘋（如白斑症，濕疹或乾癬等）是否相同，至今仍不確定。

上帝住在兩個天堂裡，其中一個是聖潔的心。

English

        Chapters 11-15 set forth laws regarding uncleanness caused by animals, birth, leprosy, and discharges. Holiness demands a holy lifestyle. Ceremonial purity is an indispensable part of worshiping a holy God, though it did impose some restrictions. For the Israelites this meant dietary laws, strict health requirements, and temporary quarantines after contact with potentially harmful substances. The word unclean occurs more than 100 times in these chapters, showing that ceremonial uncleanness (which is in fact disobedience) is no small matter with God.

        Rules and restrictions bring out the absolute worst in people! There is something about seeing a sign that says "Wet Paint—Do Not Touch" that makes us a bit "touchy." Commands such as "Keep Off the Grass" or "Don't Feed the Chimps" or "Speed Limit 55" seem to whisper in our ears, "I dare you ..."
        But did yon ever stop to think why those rules are there? Someone is trying to look out for the best interests of you and others. They know that fresh paint looks better on park benches than on pants; that grass stays prettier when a horde of people isn't trampling it to death; that chimps don't survive well on a diet of Cheetos; and that gas—and people—last longer when driving safely. Such rules are for your own good.
        The same was true for many of Israel's laws. God gave them for His people's protection: so no scavenger animals for dinner, no contact with leprous people, and plenty of baths! In today's passage look for ways God protected His people through the laws He gave. He has the same desire for you!

        Leprosy Then and Now
        It is doubtful that modern-day leprosy (which cripples and disfigures) is the same as Levitical or New Testament “leprosy” (which was a white, scaly disease, much like eczema or psoriasis).

The Lord has two heavens to dwell in, and the holy heart is one of them..