Genesis 23:9

23:9 if he will sell me the cave of Machpelah that belongs to him; it is at the end of his field. Let him sell it to me publicly for the full price, so that I may own it as a burial site.”

Genesis 23:13

23:13 and said to Ephron in their hearing, “Hear me, if you will. I pay to you the price of the field. Take it from me so that I may bury my dead there.”

Genesis 23:16

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.