32“For ask now of the days that are past, which were before you, since the day that God created man on the earth,and ask from one end of heaven to the other, whether such a great thing as this has ever happened or was ever heard of.
Moses is inviting God's people to ask a rhetorical question: ask of all of human history whether anything similar to Israel's experience of God has been known before.
32 “For ask now of the days that are past, which were before you, since the day that God created man on the earth, and ask from one end of heaven to the other, whether such a great thing as this has ever happened or was ever heard of.