Genesis 23:16-18

23:16 So Abraham agreed to Ephron’s price and weighed out for him the price that Ephron had quoted in the hearing of the sons of Heth – 400 pieces of silver, according to the standard measurement at the time.

23:17 So Abraham secured Ephron’s field in Machpelah, next to Mamre, including the field, the cave that was in it, and all the trees that were in the field and all around its border, 23:18 as his property in the presence of the sons of Heth before all who entered the gate of Ephron’s city.

Jeremiah 32:10-12

32:10 I signed the deed of purchase, sealed it, and had some men serve as witnesses to the purchase. I weighed out the silver for him on a scale. 32:11 There were two copies of the deed of purchase. One was sealed and contained the order of transfer and the conditions of purchase. The other was left unsealed. 32:12 I took both copies of the deed of purchase and gave them to Baruch son of Neriah, the son of Mahseiah. I gave them to him in the presence of my cousin Hanamel, the witnesses who had signed the deed of purchase, and all the Judeans who were housed in the courtyard of the guardhouse.