Rashi on Exodus 16:33/רש"י על שמות ט״ז:ל״ג

1צנצנת is an earthern flask, as it is translated in the Targum (cf. Mekhilta).

2‘והנח אתו לפני ה AND LAY IT UP BEFORE THE LORD — before the Ark; this verse, of course, was not spoken until the tent of meeting had been built and the Ark was placed therein, but it is written here in the chapter about the Manna, as being its appropriate place.