The 'son' is Shem [BN becomes ShM by means of a cipher], who was the son of Noah who according to tradition taught Abraham the secrets of the letters and sacred names [shem in Hebrew means 'name'] as recorded by Abraham in the Sefer Yetzirah.
Nupay kasta, makapakigtot ti sungbat ni Jesus: “No annaknakayo ni Abraham, aramidenyo met koma dagiti inaramidna.”