Once Moses had taught Aaron and his sons the expectation of God upon their lives and their duties to him, he had to teach the rest of the congregation of Israel what God expected of them. Yes, he had given them the Ten Commandments, but Moses realized that the law must be repeated to concrete them in their minds; this is something you will find throughout scripture; if you read it straight through, you will notice that he restates himself often and gives us many chances to firm up his precepts in our minds. However, the most essential part of what they learned, and we need to take it seriously, is how to reverence God and love him more than anything. Because he is holy, as his children, we represent him, so he expects us to be holy. We must show the world that although we live in it, we are separated from it because Jesus has parted us out as holy. Our lives should reflect him to encourage others to join God’s kingdom. And, as often as you can, share your testimony so others know how good God is and how wonderful our Savior is for drawing us out of the filthy world and setting us apart as a holy people.
But as he which hath called you is holy, so be ye holy in all manner of conversation; Because it is written, Be ye holy; for I am holy. 1 Peter 1:15-16
Speak unto all the congregation of the children of Israel, and say unto them, Ye shall be holy: for I the LORD your God am holy. Leviticus 19:2