TSK · Genesis 46:9

Then Reuben said to his father,“You may put my two sons to death if I do not bring him back to you. Put him in my care and I will bring him back to you.”

Now these are the names of the sons of Levi, according to their records: Gershon, Kohath, and Merari.(The length of Levi’s life was 137 years.)

These were the families of the Reubenites; and those numbered of them were 43,730.