Parashas Mishpatim · Passuk 24:10
Chabad.org — English translation + Rashi
Torah Temimah points to Yerushalmi Sukkah 4:3 (verified). (verified).
Sefaria — Exodus 24:10
Sefaria — Sotah 17a
E-Daf — Sotah 17a
English: Resh Lakish explains that the sapphire brick represents the period of Egyptian bondage; after redemption it no longer belongs beneath God's feet. Bar Kappara adds that the image was visible in the heavens during the bondage and disappeared after the redemption.
On the daf / in context: See the cited source for the full section.
Derash on the verse.