דַּבֶּר־נָ֖א בְּאָזְנֵ֣י הָעָ֑ם וְיִשְׁאֲל֞וּ אִ֣ישׁ ׀ מֵאֵ֣ת רֵעֵ֗הוּ וְאִשָּׁה֙ מֵאֵ֣ת רְעוּתָ֔הּ כְּלֵי־כֶ֖סֶף וּכְלֵ֥י זָהָֽב׃
請你說給百姓聽，叫他們男的向鄰舍、女的向鄰婦索取銀器和金器。
Rashi
דבר נא SPEAK נא — The word נא is always an expression of entreaty. Here it means: I entreat you, admonish them about this which follows (impress this injunction upon them), so that righteous man, Abraham, may not say: the prophecy (Genesis 15:13) “they shall serve them, and they shall afflict them” He permitted to be fulfilled in them, but the promise (Genesis 15:14) “and afterwards they shall go forth with great substance” He did not bring to fulfilment for them (Berakhot 9a-b).
Ramban
SPEAK NOW IN THE EARS OF THE PEOPLE. I.e., after you depart from Pharaoh.
Rashbam
וישאלו, to be an outright gift, just as in Psalms 2,8 שאל ממני ואתנה נחלתך, “ask of Me, and I will give your inheritance.”