“Hear, O Israel: The LORD is our God, the LORD is one. Love the LORD your God with all your heart and with all your soul and with all your might. These commandments that I give you today are to be upon your hearts. Impress them on your children. Talk about them when you sit at home and when you walk along the road, when you lie down and when you get up. Tie them as symbols on your hands and bind them on your foreheads. Write them on the doorframes of your houses and on your gates.”
Second Reading -- Acts 1:8-9, 12-14; 2:1-4.
After He had suffered, Jesus showed Himself and said to the apostles: "You will receive power when the Holy Spirit comes on you; and you will be my witnesses in Jerusalem, and in all Judea and Samaria, and to the ends of the earth." And after He had said these things, He was lifted up to heaven while they were looking on, and a cloud received Him out of their sight.
Then they returned to Jerusalem from the hill called the Mount of Olives, a Sabbath day's walk from the city. When they arrived, they went upstairs to the room where they were staying. They all joined together constantly in prayer, along with the women and Mary the mother of Jesus.
When the time for Pentecost was fulfilled, they were all in one place together. And suddenly there came from the sky a noise like a strong driving wind, and it filled the entire house in which they were. Then there appeared to them tongues as of fire, which parted and came to rest on each one of them. And they were all filled with the Holy Spirit and began to speak in different tongues, as the Spirit enabled them to proclaim.
Third Reading -- Mt. 22:34-40; 5:17-19, 43-48; Jn. 13:34-35.
Hearing that Jesus had silenced the Sadducees, the Pharisees got together. One of them, an expert in the law, tested him with this question: "Teacher, which is the greatest commandment in the Law?"
Jesus said to him, “‘You shall love the LORD your God with all your heart, with all your soul, and with all your mind.’ This is the first and great commandment. And the second is like it: ‘You shall love your neighbor as yourself.’ On these two commandments depend the whole Law and the Prophets."
[On another occasion, Jesus said,] “Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them. I tell you the truth, until heaven and earth disappear, not the smallest letter, not the least stroke of a pen, will by any means disappear from the Law until everything is accomplished. Anyone who breaks 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 practices and teaches these commands will be called great in the kingdom of heaven. . . . You have heard that it was said, 'Love your neighbor and hate your enemy.' But I tell you: Love your enemies and pray for those who persecute you, that you may be children of your Father in heaven. He causes His sun to rise on the evil and the good, and sends rain on the righteous and the unrighteous. If you love those who love you, what reward will you get? Are not even the tax collectors doing that? And if you greet only your brothers and sisters, what are you doing more than others? Do not even pagans do that? Be perfect, therefore, as your heavenly Father is perfect.”
[And on the night that He was betrayed, Jesus said,] "A new command I give you: Love one another. As I have loved you, so you must love one another. By this all people will know that you are my disciples, if you love one another."