Ye are witnesses
Genesis 23:16-18
And Abraham hearkened unto Ephron; and Abraham weighed to Ephron the silver, which he had named in the audience of the sons of Heth, four hundred shekels of silver, current money with the merchant.
And the field of Ephron, which was in Machpelah, which was before Mamre, the field, and the cave which was therein, and all the trees that were in the field, that were in all the borders round about, were made sure
Unto Abraham for a possession in the presence of the children of Heth, before all that went in at the gate of his city.
Jeremiah 32:10-12
And I subscribed the evidence, and sealed it, and took witnesses, and weighed him the money in the balances.
So I took the evidence of the purchase, both that which was sealed according to the law and custom, and that which was open:
And I gave the evidence of the purchase unto Baruch the son of Neriah, the son of Maaseiah, in the sight of Hanameel mine uncle's son, and in the presence of the witnesses that subscribed the book of the purchase, before all the Jews that sat in the court of the prison.