A kesitah is an unknown amount of money. It is typically just translated as a piece or pieces of silver. In Genesis 33:19 and Joshua 24:32 it is recorded that Jacob paid 100 kesitahs for the land near Shechem. Joseph’s bones were carried out of Egypt and later buried in that location according to Joshua 24.
In Job 42:11, all of Job’s friends comforted him and gave him a kesitah and a gold ring.
The oldest Greek translations of the Hebrew word kesitah translate the word as lamb. Because of this, it has been suggested that a kesitah is either the price of a lamb in the days of Job and Jacob, or it was a form of currency that was cast in the shape of a lamb.