Matthew 5:16, and then verses 17-19

Matthew 5:16-19 (NKJV)
​16 In the same way, let your light shine before others, that they may see your good deeds and glorify your Father in heaven.

The Fulfillment of the Law
​17 “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. 18 For truly I tell you, 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. 19 Therefore anyone who sets aside one of the least of these commands and teaches others accordingly 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.