TT #1 · Parashas Noach · First Aliyah · Passuk 6:9
These are the generations of Noach: Noach was a righteous man, blameless in his generations; Noach walked with God.
Torah Temimah points to Eruvin 18b (R’ Yirmiyah ben Elazar).
E-Daf image — Eruvin 18b (size=3)
Shas / HebrewBooks PDF of the daf
English: “A righteous man, blameless.” And later it is written “And Hashem said to Noach … you have I seen righteous before Me” — R’ Yirmiyah ben Elazar said: This teaches that one states part of a person’s praise in his presence and the whole of it not in his presence.
Custom (diyuk from the differing formulations of praise in the presence versus the absence of the subject).
Partial praise is appropriate in a person’s presence; complete praise is given only when he is not present. The Torah models this even with regard to Noach.