Rashi on Numbers 17:3/רש"י על במדבר י״ז:ג׳

1החטאים האלא בנפשתם THESE SINNERS AGAINST THEIR OWN SOULS — i.e. who became wilful transgressors against their own souls, because they rebelled against the Holy One, blessed be He.

2רקעי means beaten out (flattened).

3פחים are plates beaten out thin, tendus in O. F.

4צפוי למזבח FOR AN OVERLAYING FOR THE ALTAR — i.e. for the copper altar.

5ויהיו לאות AND THEY SHALL BE AS AN אות — The word לאות is the same as לזכרון, something to be mentioned (cf. Exodus 13:9) — that people will always say: These plates were from (once belonged to) those who raised dissension about the priesthood and were burnt.