Rashi on Deuteronomy 4:34/רש"י על דברים ד׳:ל״ד

1הנסה אלהים which means, HAS ANY GOD DONE MIRACLES (לבוא לקחת לו גוי וגו׳ ,(נס TO GO AND TAKE HIM A NATION [FROM THE MIDST OF A NATION] etc. — All these letters ה are interrogative prefixes, and therefore they are vowelled with Chataph Patach: הֲנהיה, הֲנשמע, הֲשמע, הֲנסה.

2במסות BY TRIALS — through trials imposed upon Him He showed them His mighty deeds, as e.g., (Exodus 8:5) “Boast yourself over Me”, whether I am able to do so: here you have a trial (putting God to the proof).

3באתת i.e. BY SIGNS to confirm that he is the messenger of the Omnipresent, as e.g., (Exodus 4:2) “What is that in your hand?"

4ובמפתים these are WONDERS: — that He brought upon them (the Egyptians) wondrous plagues.

5ובמלחמה AND BY WAR, at the Red Sea, as it is said, (Exodus 14:25) “For the Lord fought for them".