Leviticus 26

2 The Sabbath was the weekly observance dedicated to God. We are supposed to remember God always, but the Sabbath was to be a day of rest from secular labor so that people could devote themselves especially to prayer, meditation, relationships, and good deeds.

The tabernacle (and later the Temple) was to be set apart for sacred use. It would be defiled by secular and common uses. These were to be observed by God's command.

4 Israel had been raised in Egypt where water was taken from the Nile. In Canaan, they would have to depend on rainfall, not irrigation, to adequately water their crops. God can control the weather and promises to bless the Israelites especially with good weather and crops if they obey His commands.

This is a conditional blessing. This is different from the blessing to Abraham, which was eternal. We will later see Israel go through cycles of obedience and this blessing fluctuates with it. However, the promise to Abraham will continue even beyond Judgement Day.

5 This describes a productivity that is nothing short of miraculous. It also describes special protection from God.
6 Israel would not be threatened by other countries. God can make even one's enemies be at peace with him (Prov 16:7). Another important aspect of this peace is that there would be peace within. If everyone followed the commands, there would be no crime. If they all loved God and each other, there would be no bad relationships.
11 Sin, by its very definition, is rebellion against God. God can not force people to love Him, so His relationship with them is limited if they reject Him. Furthermore, sin is abhorrent to God. He is loving, kind, and good. Rebellion against Him spawns hate, selfishness, and evil. These things are against God's very nature, and He despises these things. The Israelites were given a worship center and rituals to follow. Their obedience to them (coupled with their faith) would prove that they loved Him. God delights to live among people who honor and love Him. Even today, Christians show their love for God with proper worship and living practices.
12 When the Israelites were obedient, they could be assured that God was with them. God had chosen them to be His people, and they agreed to give up all idols and recognize Him as the one true God.

The Christian has the added benefit of the indwelling of the Holy Spirit. Thus, God not only is present with us; He is present in us. Abraham's physical descendents were specially chosen to be God's people, but God has graciously extended that invitation to the Gentiles through Jesus' sacrifice. We too, though not bound by the Mosaic Law, are called to be obedient to those things that please God.

13 People were designed to be in service to God. God is not an oppressive tyrant as Pharaoh was. In fact, when people are obedient to God they can walk upright. They are not stooped over with burdens. They are joyful and free, knowing that they are living the way God designed people to live.