Matthew 1:18-21 (NKJV)
18 Now the birth of Jesus Christ was as follows: After His mother Mary was betrothed to Joseph, before they came together, she was found with child of the Holy Spirit.
19 Then Joseph her husband, being a just man, and not wanting to make her a public example, was minded to put her away secretly.
20 But while he thought about these things, behold, an angel of the Lord appeared to him in a dream, saying, “Joseph, son of David, do not be afraid to take to you Mary your wife, for that which is conceived in her is of the Holy Spirit.
21 And she will bring forth a Son, and you shall call His name Jesus, for He will save His people from their sins.”
John 1:29 (KJV)
29 The next day John seeth Jesus coming unto him, and saith, Behold the Lamb of God, which taketh away the sin of the world.
1 John 2:1,2 (KJV)
1 My little children, these things write I unto you, that ye sin not. And if any man sin, we have an advocate with the Father, Jesus Christ the righteous:
2 And he is the propitiation for our sins: and not for ours only, but also for the sins of the whole world.