'Bill' in the Bible

They asked him, "Why then did Moses command us to give her a bill of divorce, and divorce her?"

He said, 'A hundred batos of oil.' He said to him, 'Take your bill, and sit down quickly and write fifty.'

Then he said to another, 'How much do you owe?' He said, 'A hundred cors of wheat.' He said to him, 'Take your bill, and write eighty.'