What is the meaning of "u'mi'Bamos ha'Gai ... "?
Ramban, Targum Onkelos and Targum Yonasan: 'From the desert the well went with them down to the valleys and from the valleys to the high places'.
Rashbam: 'Matanah', 'Nachaliel' and 'Bamos' are all place-names.
Seforno: The Pasuk implies that in spite of flowing with them to all of these places, the well lost none of its water along the way - an additional facet of its supernatural qualities.
Refer to 21:19:1:2 & 8.
What is the meaning "Rosh ha'Pisgah ve'Nishkafah Al P'nei ha'Yeshimon"?
Rashi #2 (citing the Midrash Tanchuma): This refers to the well, which was buried (after Moshe died) in the Sea of Teverya (the Kineret). 3 The Pasuk means that if someone stands on the cliff of Yeshimon looks down into the sea, he will see something that resembles a sieve - which in fact, is the well of Miriam. 4
Refer to 21:18:4:2.
Rashi: A high place, as in Tehilim, 48:14, "Pasgu Armenosehah".
Rashi: So-called because it was wasteland.
According to Targum Yonasan the well disappeared on top of the cliff.
See Torah Tem imah, note 20.
Why did the well stop accompanying them specifically at that spot?
Rashi: Because that is where Moshe died. 1
Targum Yonasan: Because they were lax in the Mitzvah of Torah-study.
Oznayim la'Torah (on Pasuk 16): Becsuse they now had many streans of water from whih to draw.
Sifsei Chachamim: Because, even though it ceased after the death of Miriam, it returned on the merit of Moshe.