Testify that Jesus is the Lord

Everyone who acknowledges me before men, I also will acknowledge before my Father who is in heaven, but whoever denies me before men, I also will deny before my Father who is in heaven. -- Matthew 10:32-33 (ESV)

And John wrote:

No one who denies the Son has the Father. Whoever confesses the Son has the Father also. -- 1 John 2:23 (ESV)

We have seen and testify that the Father has sent his Son to be the Savior of the world. Whoever confesses that Jesus is the Son of God, God abides in him, and he in God. -- 1 John 4:14-15 (ESV)