'Lord is Witness' in the Bible

The elders of Gilead said to Jephthah, “The Lord is the witness between us; be assured that we will do as you have said.”

Samuel said to them, “The Lord is a witness against you, and [Saul] His anointed is a witness this day that you have not found anything in my hand.” And they answered, “He is a witness.”

And Samuel said to the people, The Lord is witness, who gave authority to Moses and Aaron, and who took your fathers up out of the land of Egypt.

And of this which thou and I have spoke, behold the LORD is witness between thee and me forever."