כִּ֤י עֵֽינֵיכֶם֙ הָֽרֹאֹ֔ת אֶת־כָּל־מַעֲשֵׂ֥ה יְהוָ֖ה הַגָּדֹ֑ל אֲשֶׁ֖ר עָשָֽׂה׃
而是對你們說，因為你們親眼看見了永恆者所行的一切大作為。
Rashi
כי עיניכם הראת BUT YOUR EYES HAVE SEEN — This is to be connected with the verse mentioned above (v. 2), thus: (2) For not with your children am I speaking who do not know, but with you whose eyes have seen, etc.
Sforno
'כי עיניכם הרואות את כל מעשה ה, which He performed against those who rebelled against Him, to Pharaoh in Egypt, to Pharaoh at the Sea, to those who rebelled against Him in the desert, Datan and Aviram,. It is therefore up to you who have experienced all this with your own eyes to warn your children who have not been eyewitnesses to these events. Therefore,