Parashas Terumah
Rabbi Yosei reads the verse as proof that the Mishkan had one partition curtain between the Holy and the Holy of Holies. The two-curtain arrangement belonged to the Second Temple, where the sages were uncertain about the status of the space corresponding to the one-cubit partition of the First Temple.
This page presents the primary Chazal passage identified by Torah Temimah for this passuk. The explanation above is a concise description of what that passage teaches, without reproducing Torah Temimah's commentary.