Matthew 1 (ESV)
18 Now the birth of Jesus Christ took place in this way. When his mother Mary had been betrothed to Joseph, before they came together she was found to be with child from the Holy Spirit.
19 And her husband Joseph, being a just man and unwilling to put her to shame, resolved to divorce her quietly.
20 But as he considered these things, behold, an angel of the Lord appeared to him in a dream, saying, "Joseph, son of David, do not fear to take Mary as your wife, for that which is conceived in her is from the Holy Spirit.
21 She will bear a son, and you shall call his name Jesus, for he will save his people from their sins."
John 3 (ESV)
16 "For God so loved the world, that he gave his only Son, that whoever believes in him should not perish but have eternal life.
17 For God did not send his Son into the world to condemn the world, but in order that the world might be saved through him.
1 John 2 (ESV)
My little children, I am writing these things to you so that you may not sin. But if anyone does sin, we have an advocate with the Father, Jesus Christ the righteous.
2 He is the propitiation for our sins, and not for ours only but also for the sins of the whole world.
3 And by this we know that we have come to know him, if we keep his commandments.
4 Whoever says "I know him" but does not keep his commandments is a liar, and the truth is not in him,
5 but whoever keeps his word, in him truly the love of God is perfected. By this we may know that we are in him:
6 whoever says he abides in him ought to walk in the same way in which he walked.
7 Beloved, I am writing you no new commandment, but an old commandment that you had from the beginning. The old commandment is the word that you have heard.
Jeremiah 31 (ESV)
31 "Behold, the days are coming, declares the Lord, when I will make a new covenant with the house of Israel and the house of Judah,
32 not like the covenant that I made with their fathers on the day when I took them by the hand to bring them out of the land of Egypt, my covenant that they broke, though I was their husband, declares the Lord.
33 For this is the covenant that I will make with the house of Israel after those days, declares the Lord: I will put my law within them, and I will write it on their hearts. And I will be their God, and they shall be my people.