אַֽל־תִּזְכְּר֖וּ רִֽאשֹׁנ֑וֹת וְקַדְמֹנִיּ֖וֹת אַל־תִּתְבֹּנָֽנוּ׃
Remember ye not the former things, Neither consider the things of old.
Rashi on Isaiah
Remember not the first events These miracles that I mention to you, that I performed in Egypt do not remember them from now on, for you shall be engaged in this redemption, to thank and to praise.
Rashi on Isaiah
do not meditate Do not ponder about them; do not pay attention to them.