Both the Old testament and the Hebrew bible, mention the father of Shelah only twice, once in Genesis 11: 12; where it is said that Arpachshad is the father of Shelah, and in 1 Chronicles 1: 18; again; "Arpachshad is the father of Shelah.

And yet we read in the gospel of Luke, which was written some 300 years before the Roman canon was compiled, that Arpachshad is the father of Cainan/Kainam, who is the father of Shelah. See Luke 3: 35-36.

From which book. not recorded in the Roman canon, did Luke receive the information that Cainam/Kainam was the father of Shelah?