Genesis 11:13
And after he had become the father of Shelah, Arphaxad lived 403 years and had other sons and daughters.
Berean Standard Bible
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And Arphaxad lived after he begat Salah four hundred and three years, and begat sons and daughters.
Arpachshad lived four hundred three years after he became the father of Shelah, and became the father of more sons and daughters.