Jesus taught his disciples to do and teach the commandments
“Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill [πληρῶσαι | plērōsai – make full, maximize] them. For truly, I say to you, until heaven and earth pass away, not an iota, not a dot, will pass from the Law until all is accomplished. Therefore whoever relaxes one of the least of these commandments and teaches others to do the same will be called least in the kingdom of heaven, but whoever does them and teaches them will be called great in the kingdom of heaven. For I tell you, unless your righteousness exceeds that of the scribes and Pharisees, you will never enter the kingdom of heaven.” (Matthew 5:17-20)
“Pray then like this: “Our Father in heaven, hallowed be your name. Your kingdom come, your will be done, on earth as it is in heaven.” (Matthew 6:10)
“So whatever you wish that others would do to you, do also to them, for this is the Law and the Prophets.” (Matthew 7:12)
“And he said to him, “Why do you ask me about what is good? There is only one who is good. If you would enter life, keep the commandments.” (Matthew 19:17)
“Teacher, which is the great commandment in the Law?” And he said to him, “You shall love the Lord your God with all your heart and with all your soul and with all your mind. This is the great and first commandment. And a second is like it: You shall love your neighbor as yourself. On these two commandments depend all the Law and the Prophets.” (Matthew 22:36-40)
“Everyone then who hears these words of mine and does them will be like a wise man who built his house on the rock. And the rain fell, and the floods came, and the winds blew and beat on that house, but it did not fall, because it had been founded on the rock. And everyone who hears these words of mine and does not do them will be like a foolish man who built his house on the sand. And the rain fell, and the floods came, and the winds blew and beat against that house, and it fell, and great was the fall of it.” (Matthew 7:24-27)
This next one can trip people up because of the word ‘Pharisees’.
“Then Jesus said to the crowds and to his disciples, “The scribes and the Pharisees sit on Moses’ seat, so practice and observe whatever they tell you–but not what they do. For they preach, but do not practice. They tie up heavy burdens, hard to bear, and lay them on people’s shoulders, but they themselves are not willing to move them with their finger.” (Matthew 23:1-4)
Scholars argue about what the seat of Moses was exactly. Yet the various theories agree on the idea that Jesus was instructing people to base their actions on what the Torah said. But since the Pharisees didn’t actually obey parts of the Torah, Jesus said not to do what they do.
“Woe to you, scribes and Pharisees, hypocrites! For you tithe mint and dill and cumin, and have neglected the weightier matters of the law: justice and mercy and faithfulness. These you ought to have done, without neglecting the others.” (Matthew 23:23)
It is notable that we don’t sense any change in the plan after the resurrection. The last command Jesus gave before ascending was to teach what he had commanded.
“Go therefore and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit, teaching them to observe all that I have commanded you [including Matthew 5:19, 19:17, 23:3, 23:20, Mark 7:8-9, ]. And behold, I am with you always, to the end of the age.” (Matthew 28:19-20)
“and said to him, “See that you say nothing to anyone, but go, show yourself to the priest and offer for your cleansing what Moses commanded, for a proof to them.” (Mark 1:44)
Jesus also chastised those who elevated their own traditions above his Father’s law.
“You leave the commandment of God and hold to the tradition of men. And he said to them, “You have a fine way of rejecting the commandment of God in order to establish your tradition!” (Mark 7:8-9)
“He answered them, “What did Moses command you?”” (Mark 10:3)
“And he charged him to tell no one, but “go and show yourself to the priest, and make an offering for your cleansing, as Moses commanded, for a proof to them.”” (Luke 5:14)
“And behold, a lawyer stood up to put him to the test, saying, “Teacher, what shall I do to inherit eternal life?” He said to him, “What is written in the Law? How do you read it?” And he answered, “You shall love the Lord your God with all your heart and with all your soul and with all your strength and with all your mind, and your neighbor as yourself.” And he said to him, “You have answered correctly; do this, and you will live.” (Luke 10:25-28)
“But it is easier for heaven and earth to pass away than for one dot of the Law to become void.” (Luke 16:17)
Jesus rebuked the Pharisees for not keeping the Law.
“Has not Moses given you the law? Yet none of you keeps the law. Why do you seek to kill me?” (John 7:19)
“If anyone hears my words and does not keep them, I do not judge him; for I did not come to judge the world but to save the world. The one who rejects me and does not receive my words has a judge; the word that I have spoken will judge him on the last day.” (John 12:47-48)
“If you love me, you will keep my commandments.” (John 14:15)
“Whoever has my commandments and keeps them, he it is who loves me. And he who loves me will be loved by my Father, and I will love him and manifest myself to him.” (John 14:21)
“As the Father has loved me, so have I loved you. Abide in my love. If you keep my commandments, you will abide in my love, just as I have kept my Father’s commandments and abide in his love.” (John 15:9-10)
“This is my commandment, that you love one another as I have loved you. Greater love has no one than this, that someone lay down his life for his friends. You are my friends if you do what I command you.” (John 15:12-14)