en_tn/lev/10/19.md

this thing has happened

Aaron is referring to the death of his two sons.

Would it have been pleasing in the sight of Yahweh?

These sacrifices were to be eaten with joy and happiness. Aaron uses a question to emphasize that Yahweh would not be pleased for him to eat the sacrifices since he is sad because of his sons' deaths. AT: "Certainly, Yahweh would not have been pleased." (See: rc://en/ta/man/translate/figs-rquestion)