The most famous verse in the book of Joshua is when Joshua says to Israel, “Choose you this day whom you will serve but as for me and my house, we will serve the Lord.” I bet many of you have that verse hanging somewhere in your home. But if I had to pick just one verse from Joshua and say this is the one we ought to put on our wall, I would pick Joshua 22:5. I want to challenge you, no, I want to dare you to memorize this verse. It's powerful verse in which Joshua says this, “Only be very careful to observe the commandment and the law which Moses the servant of the Lord commanded you, to love the Lord your God and walk in all His ways and keep His commandments and hold fast to Him and serve Him with all your heart and with all your soul.”
All of those phrases come from the book of Deuteronomy. The overall theme is to observe the commandments of Moses. He now lists them. First of all, love the Lord your God. If you love the Lord your God you're going to next walk in God's ways and keep His commandments. He then concludes with hold fast to God. All of this in one verse of the Bible.