John Gill Commentary Deuteronomy 7:19

"the great trials which thine eyes saw, and the signs, and the wonders, and the mighty hand, and the outstretched arm, whereby Jehovah thy God brought thee out: so shall Jehovah thy God do unto all the peoples of whom thou art afraid." — Deuteronomy 7:19 (ASV)

The great temptations which your eyes saw, and the signs, and
the wonders
The miracles wrought in Egypt; see (Deuteronomy 4:34)

and the mighty hand, and stretched out arm, whereby the Lord your God
brought you out ;
that is, out of Egypt, which was an instance and proof of his almighty power:

so shall the Lord your God do unto all the people of whom you are
afraid ;
not perform the same miraculous operations among them, but exert the same power in the destruction of them, and in dispossessing them of their land, as in destroying the Egyptians, and delivering Israel from among them.