Psalm 119:13 With my lips I declare all the rules of your mouth.
In this verse we find a content and satisfied tone. David tells of how he has built up and encouraged God's people with what he himself had learned from God's law. This is something he has done in daily life in his conversations with people. This is something he's doing all the time. He says he likes to say what the Word of God says. This is not a quiet process in his heart, but he does it with his lips. He quotes the word of God aloud, both for himself and for others to the hear what God's law says.
This is in accordance with the instructions God gave to the people of Israel through Moses:
And these words that I command you today shall be on your heart. You shall teach them diligently to your children, and shall talk of them when you sit in your house, and when you walk by the way, and when you lie down, and when you rise. You shall bind them as a sign on your hand, and they shall be as frontlets between your eyes. You shall write them on the doorposts of your house and on your gates. (Dt 6:6–9).
It is very important to treasure the word of God in your heart in order to be able to tell what the word of God is saying. If we are to practice the Word of God and tell His Law to others, we must know the Word by heart. When we have hidden the word of God in our hearts, it is always available to us. This is what Jesus is teaching; that what fills the heart, the mouth speaks. Then we can do what God says, we shall do: Impress God's law in our children and talk about the Word at home and abroad. We will talk about God's good law and instructions when we are at home and when we walk by the road, when we lie down and when we get up.
In this verse, David says that this is something he practices. His lips list all the laws from the mouth of God. It is a good thing to do this for yourself, for it strengthens us in our faith and helps us to think about what God's Word means to victory. Other translations support this: TV says "I will repeat aloud. ..." Neb says: "I say them over, one by one" and BJ says "I will enumerate them all".
It is important to note that he enumerates, tells, and talks about all the laws from the mouth of God. He is telling them over and over, one after the other. He does not leave out any the commandments. He does not take away any of them, but proclaims them all. NJV says: “all the rules You proclaimed”; NJB says: "all the judgments you have given"; NEB says: "the decrees that you proclaimed." TEV says: "all the laws you have given." The rich Hebrew word "mispat" is used in this verse and it explains the many different versions.
We live in times when it is more important than ever before to be bold in proclaiming what God's law says. We can't afford to be quiet. We must stand up for the Word of God by having the Word on our lips throughout the day. We must let people understand that the word of God is our source of life. It is the word of God that has given us control over our lives. We are not ashamed of God's laws for they are all good and for the good of all human beings.
I speak continually of your laws as I recite out loud your counsel to me. (TPT)