Keep 2 Shabbatot, See the Beit Hamikdash
In Parshat Kedoshim (Vayikra 19:30):
אֶת-שַׁבְּתֹתַי תִּשְׁמֹרוּ, וּמִקְדָּשִׁי תִּירָאוּ: אֲנִי, יְהוָה.
Ye shall keep My sabbaths, and reverence My sanctuary: I am the LORD.
A whole bunch of Darshanim want to take a hint from this verse to use it for the famous saying of Haza"l to say that it means: if the Jews would keep 2 Shabbatot, they will merit to see the Beit Hamikdash.
These Darshanim include:
The Shelah Hakadosh
The obvious question is that תיראו means "You will fear" - not "You will see".
The Shelah Hakadosh wants to explain that this is similar to Hagiga 2a, where the word יראה is used both actively and passively. However, being that both of those are referring to sight - and not fear - whereas here, we're trying to learn sight from fear, I have not merited to understand the Shelah's holy words.
My only answer is אין מקשין על הדרוש.
May we all keep Shabbat holy and merit to see the third Beit Hamikdash built in its glory speedily in our days, Amen.