אֵֽרֲדָה־נָּ֣א וְאֶרְאֶ֔ה הַכְּצַעֲקָתָ֛הּ הַבָּ֥אָה אֵלַ֖י עָשׂ֣וּ ׀ כָּלָ֑ה וְאִם־לֹ֖א אֵדָֽעָה׃
我要下去看看，他們所做的是否真像那傳到我這裡的呼聲一樣；若是這樣，就要將他們滅盡；若不是，我也必知道。」
Shenei Luchot HaBerit
ארדה נא ואראה . G–d uses this expression both here before finalizing the decree to destroy Sodom and before deciding how to deal with the generation that built the Tower of Babel. Rashi's comment on this is most appropriate.