וְנֹ֨חַ דנאל [דָּנִיֵּ֣אל] וְאִיּוֹב֮ בְּתוֹכָהּ֒ חַי־אָ֗נִי נְאֻם֙ אֲדֹנָ֣י יְהוִ֔ה אִם־בֵּ֥ן אִם־בַּ֖ת יַצִּ֑ילוּ הֵ֥מָּה בְצִדְקָתָ֖ם יַצִּ֥ילוּ נַפְשָֽׁם׃ (פ)
si Noé, Daniel et Job s’y trouvent, par ma vie, dit le Seigneur Dieu, ils ne sauveront ni fils, ni fille; eux seuls par leur vertu sauveront leur vie."
Radak
ויולד נח, why does the Torah mention this now when it had already told us about his three sons in 5,32? The Torah wanted us to know that these sons were born after Noach had already been certified by the Torah as “walking with G’d.” Mention of these sons here indicates that he raised his sons to believe in G’d and to walk in His ways, also. Had his sons not been good people they would not have been saved at the time of the deluge, even though their father was a righteous person. We have already cited Ezekiel 14,20 in which we were told that Noach’s merits did not suffice to save others beyond himself and his wife.