I think for the most
part this is a reference to God's omniscience and omnipotence. In other words God is everywhere at all times
and He sees and knows what the truth is.
God witnesses EVERYTHING!
Genesis 31:50(NKJV)
If you afflict my
daughters, or if you take other
wives besides my daughters, although
no man is with us—see, God is witness between you and me!”
1 Samuel 12:5(NKJV)
Then he said to
them, “The Lord is witness
against you, and His anointed is
witness this day, that you have not found anything in my hand.” And they
answered, “He is witness.”
1 Samuel 20:12(NKJV)
Then Jonathan said
to David: “The Lord God of Israel is
witness! When I have sounded out my father sometime tomorrow, or the third day, and indeed there is
good toward David, and I do not send to you and tell you,
Jeremiah 29:23(NKJV)
because they have
done disgraceful things in Israel, have committed adultery with their
neighbors’ wives, and have spoken lying words in My name, which I have not
commanded them. Indeed I know, and am
a witness, says the Lord.
Jeremiah 42:5(NKJV)
So they said to
Jeremiah, “Let the Lord be a true and faithful witness between us, if we
do not do according to everything which the Lord your God sends us by
you.
Micah 1:2(NKJV)
Hear,
all you peoples! Listen, O earth, and all that is in
it! Let the Lord GOD be a witness against you,
The Lord from His holy temple.
Malachi 2:14(NKJV)
Yet
you say, “For what reason?” Because the Lord has
been witness Between you and the wife of your youth,
With whom you have dealt treacherously; Yet
she is your companion And your wife by covenant.
Malachi 3:5(NKJV)
And
I will come near you for judgment; I will be a swift
witness Against sorcerers,
Against adulterers, Against
perjurers, Against those who exploit wage earners and
widows and orphans, And against those who turn away an
alien— Because they do not fear Me,”
Says the Lord of hosts.
John 8:18(NKJV)
I am One who bears
witness of Myself, and the Father who sent Me bears witness of Me.”
Romans 1:9-10(NKJV)
For God is my
witness, whom I serve with my spirit in the gospel of His Son, that without
ceasing I make mention of you always in my prayers,
making request if,
by some means, now at last I may find a way in the will of God to come to
you.
1 Thessalonians 2:5(NKJV)
For neither at any
time did we use flattering words, as you know, nor a cloak for
covetousness—God is witness.
1 John 5:7(NKJV)
For there are three
that bear witness in heaven: the Father, the Word, and the Holy Spirit;
and these three are one.