Job 16:19

¹⁷ yet my hands are free of violence and my prayer is pure.

¹⁸ O earth, do not cover my blood; may my cry for help never be laid to rest.

Even now my witness is in heaven, and my advocate is on high.

²⁰ My friends are my scoffers as my eyes pour out tears to God.

²¹ Oh, that a man might plead with God as he pleads with his neighbor!

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: Even now my witness is in heaven, and my advocate is on high.
KJV: Also now, behold, my witness is in heaven, and my record is on high.
WEB: Even now, behold, my witness is in heaven. He who vouches for me is on high.
ASV: Even now, behold, my witness is in heaven, And he that voucheth for me is on high.
DARBY: Even now, behold, my Witness is in the heavens, and he that voucheth for me is in the heights.
BLB: Even now, behold! My testimony [is] in the heavens, and my witness [is] in the heights.

ÅB: Selv nå har jeg mitt vitne i himmelen og i det høye en som kan stadfeste mine ord.
OTB: Likevel, mitt vitne er i himmelen;
min talsmann bor i det høye.
B1930: Selv nu har jeg mitt vidne i himmelen og i det høie en som kan stadfeste mine ord.

Romans 1:9
God, whom I serve with my spirit in preaching the gospel of His Son, is my witness how constantly I remember you
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Genesis 31:50
If you mistreat my daughters or take other wives, although no one is with us, remember that God is a witness between you and me.”
Read in context
1 Thessalonians 2:5
As you know, we never used words of flattery or any pretext for greed. God is our witness!
Read in context
1 Thessalonians 2:10
You are witnesses, and so is God, of how holy, righteous, and blameless our conduct was among you who believed.
Read in context
Romans 9:1
I speak the truth in Christ; I am not lying, as confirmed by my conscience in the Holy Spirit.
Read in context
Job 25:2
“Dominion and awe belong to God; He establishes harmony in the heights of heaven.
Read in context
Psalms 113:5
Who is like the LORD our God, the One enthroned on high?
Read in context
1 Samuel 12:5
Samuel said to them, “The LORD is a witness against you, and His anointed is a witness today, that you have not found anything in my hand.” “He is a witness,” they replied.
Read in context