It is important to understand the definition of blasphemy when looking at the Beast described in the book of Revelation. It's not just using the Lord's name in vain (see the third commandment in Exodus 20:7). It is also making the claim that you are God and able to forgive sins. I will go into more detail on this as we look further into the mark of the beast and how to identify the Antichrist.
Please look below the graphic for references to scriptures.
Exodus 22:28
28 "Do not blaspheme God or curse the ruler of your people.
Daniel 7:25
25 He will speak against the Most High and oppress his saints and try to change the set timesand the laws. The saints will be handed over to him for a time, times and half a time.
Matthew 26:63-65
63 But Jesus remained silent. The high priest said to him, "I charge you under oath by the living God: Tell us if you are the Christ, the Son of God." 64"Yes, it is as you say," Jesus replied. "But I say to all of you: In the future you will see the Son of Man sitting at the right hand of the Mighty One and coming on the clouds of heaven." 65 Then the high priest tore his clothes and said, "He has spoken blasphemy! Why do we need any more witnesses? Look, now you have heard the blasphemy.
Mark 2:4-7
4 Since they could not get him to Jesus because of the crowd, they made an opening in the roof above Jesus and, after digging through it, lowered the mat the paralyzed man was lying on. 5 When Jesus saw their faith, he said to the paralytic, "Son, your sins are forgiven." 6 Now some teachers of the law were sitting there, thinking to themselves, 7 "Why does this fellow talk like that? He's blaspheming! Who can forgive sins but God alone?"
Luke 5:20-21
20 When Jesus saw their faith, he said, "Friend, your sins are forgiven." 21 The Pharisees and the teachers of the law began thinking to themselves, "Who is this fellow who speaks blasphemy? Who can forgive sins but God alone?"
John 10:30-37
30 I and the Father are one." 31 Again the Jews picked up stones to stone him, 32 but Jesus said to them, "I have shown you many great miracles from the Father. For which of these do you stone me?"33 "We are not stoning you for any of these," replied the Jews, "but for blasphemy, because you, a mere man, claim to be God." 34 Jesus answered them, "Is it not written in your Law, 'I have said you are gods' ? 35 If he called them 'gods,' to whom the word of God came--and the Scripture cannot be broken-- 36 what about the one whom the Father set apart as his very own and sent into the world?Why then do you accuse me of blasphemy because I said, 'I am God's Son'? 37 Do not believe me unless I do what my Father does.
Revelation 13:1, 5-6
1 And the dragon stood on the shore of the sea. And I saw a beast coming out of the sea. He had ten horns and seven heads, with ten crowns on his horns, and on each head a blasphemous name. 5 The beast was given a mouth to utter proud words and blasphemies and to exercise his authority for forty-two months. 6 He opened his mouth to blaspheme God, and to slander his name and his dwelling place and those who live in heaven.
Revelation 17:3-4
3Then the angel carried me away in the Spirit into a desert. There I saw a woman sitting on a scarletbeast that was covered with blasphemous names and had seven heads and ten horns. 4 The woman was dressed in purple and scarlet, and was glittering with gold, precious stones and pearls. She held a golden cup in her hand, filled with abominable things and the filth of her adulteries.