According to the context of 1 John 5, it seems like talking about the testimony of God - that Lord Jesus Christ is the Son of God, that God has given us eternal life, and this life is in his Son. :-
7 For there are three that testify:
8 the Spirit, the water and the blood; and the three are in agreement.
5:7 并且有圣灵作见证，因为圣灵就是真理。
5:8 作见证的原来有三，就是圣灵，水，与血。这三样也都归于一。
1 John 5:7-8
Lord Jesus, who is "the Word became flesh" admitted that he is Christ:
61 But Jesus remained silent and gave no answer. Again the high priest asked him, "Are you the Christ, the Son of the Blessed One?"
62 "I am," said Jesus. "And you will see the Son of Man sitting at the right hand of the Mighty One and coming on the clouds of heaven."
Mark 14:61-62
The one from heaven also testifies - Matthew 马 太 福 音 3:16
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Some of the verses on whom God is:
一些关于神的经文:
26 Then God said, "Let us make man in our image, in our likeness...
1:26 神说，我们要照着我们的形像，按着我们的样式造人...
创 世 纪 Genesis 1:26
19 Therefore go and make disciples of all nations, baptizing them in the name of the Father and of the Son and of the Holy Spirit...
28:19 所以你们要去，使万民作我的门徒，奉父子圣灵的名，给他们施洗。（或作给他们施洗归于父子圣灵的名）
Matthew 马太福音 28:19
26 (Jesus said) But the Counselor, the Holy Spirit, whom the Father will send in my name, will teach you all things and will remind you of everything I have said to you.
14:26 (耶稣說) 但保惠师，就是父因我的名所要差来的圣灵，他要将一切的事，指教你们，并且要叫你们想起我对你们所说的一切话。
John 约 翰 福 音 14:26
13 And you also were included in Christ when you heard the word of truth, the gospel of your salvation. Having believed, you were marked in him with a seal, the promised Holy Spirit
1:13 你们既听见真理的道，就是那叫你们得救的福音，也信了基督，既然信他，就受了所应许的圣灵为印记。
Ephesians 以 弗 所 书 1:13
30 And do not grieve the Holy Spirit of God, with whom you were sealed for the day of redemption.
4:30 不要叫神的圣灵担忧。你们原是受了他的印记，等候得赎的日子来到。
Ephesians 以 弗 所 书 4:30
(5 Your attitude should be the same as that of Christ Jesus: )
6 Who, being in very nature God, did not consider equality with God something to be grasped,
7 but made himself nothing, taking the very nature of a servant, being made in human likeness.
8 And being found in appearance as a man, he humbled himself and became obedient to death-- even death on a cross!
9 Therefore God exalted him to the highest place and gave him the name that is above every name,
10 that at the name of Jesus every knee should bow, in heaven and on earth and under the earth,
11 and every tongue confess that Jesus Christ is Lord, to the glory of God the Father.
(“你们当以基督耶稣的心为心。) 他本有神的形像, 不以自己与神同等为强夺的，反倒虚己, 取了奴仆的形像, 成为人的样式。既有人的样子, 就自己卑微, 存心顺服, 以至于死, 且死在十字架上。所以神将他升为至高，又赐给他那超乎万名之上的名，
2:10 叫一切在天上的，地上的，和地底下的，因耶稣的名，无不屈膝，（腓利比书 2:5－10）”
16 "I, Jesus, have sent my angel to give you this testimony for the churches. I am the Root and the Offspring of David, and the bright Morning Star."
22:16 我，耶稣差遣我的使者为众教会将这些事向你们证明。我是大卫的根，又是他的后裔。我是明亮的晨星。
Revelation 启 示 录 22:16
17 The Spirit and... say, "Come!"...
22:17 圣灵。。。说 来。。。。
Revelation 启 示 录 22:17
20 He who testifies to these things says, "Yes, I am coming soon." Amen. Come, Lord Jesus.
22:20 证明这事的说，是了。我必快来。阿们。主耶稣阿，我愿你来。
Revelation 启 示 录 22:20
16 As soon as Jesus was baptized, he went up out of the water. At that moment heaven was opened, and he saw the Spirit of God descending like a dove and lighting on him.
17 And a voice from heaven said, "This is my Son, whom I love; with him I am well pleased."
3:16 耶稣受了洗，随既从水里上来。天忽然为他开了，就看见神的灵，彷佛鸽子降下，落在他身上。
3:17 从天上有声音说，这是我的爱子，我所喜悦的。
Matthew 马 太 福 音 3:16
39 Acknowledge and take to heart this day that the LORD is God in heaven above and on the earth below. There is no other.
4:39 所以，今日你要知道，也要记在心上，天上地下惟有耶和华他是神，除他以外，再无别神。
4:39 所以你今日要知道，心里要回想∶上天下地、惟有永恒主他是上帝；再没有别的神。 (Lu Zheng Zhong)
Deuteronomy 4:39
