Reading Psalms 119, we see the following words:
Deut 26: 16 - 19 reads
16 “This day the Lord your God commands you to observe these statutes and judgments; therefore you shall be careful to observe them with all your heart and with all your soul. 17 Today you have proclaimed the Lord to be your God, and that you will walk in His ways and keep His statutes, His commandments, and His judgments, and that you will obey His voice. 18 Also today the Lord has proclaimed you to be His special people, just as He promised you, that you should keep all His commandments, 19 and that He will set you high above all nations which He has made, in praise, in name, and in honor, and that you may be a holy people to the Lord your God, just as He has spoken.”
Deut 6 : 1 reads
“Now this is the commandment, and these are the statutes and judgments which the Lord your God has commanded to teach you, that you may observe them in the land which you are crossing over to possess,
There are many other places in the Old Testament where these words appear, but I couldn't quite grasp distinctly what they mean.