Yes indeed, “Thank You”.
These Parshos reiterate and enumerate the building of the Mishkan and the manufacturing of the Bigdei Kehunah.
In Parshas Pekudei, when Bnai Yisroel completed the building of the Mishkan and Bigdei Kehunah, the Posuk tells us: “Va’Yi’re Moshe Es Kol Ha’melochoh Ve’Heenai Osuh Oy’soh Ka’Asher Tzee’voh Hashem Keyn Osuh, Va’Yevoreich Osum Moshe“. (39, 43).
Rashi on Va’Yevoreich Osum Moshe says: Omar Lo’Hem: Yehi Rotzon She’Tishreh Schechinah Be’Ma’aseh Ye’deichem.
Asks Rav Shimshon Pincus, ZT”L, what reason was there for Moshe Rabbeinu to bless Bnai Yisroel for completing the building of the Mishkan? After all, they were commanded to carry out the Tzeevui Hashem; for them to have not done so would have been a grave Aveirah resulting in severe punishment.
Further, says Rav Pincus, we see in Parshas Shemini, after Moshe and Ahron completed the cycle with the Avodas Hakorbonos to inaugurate the Mishkan, the Posuk tells us that they again blessed Bnei Yisroel with the very same Brocho: “Va’Yovoh Moshe Ve’Aharon El Ohel Moed Va’Yeitzu Va’Yevorchu Es Ho’ohm”. And says Rashi, the Brocho was the same: “Yehi Rotzon She’Tishreh Schechinah Be’Ma’aseh Ye’deychem”.
Why did Bnei Yisroel merit to receive this Brocho twice? Once after they had completed their own hishtadlus in building the Mishkan, and second,- after Moshe and Aharon followed up by completing their own Avodas Ha’Mishkan? What connection did Moshe and Aharaon’s own Shimush Hamishkan have to do with Bnai Yisroel?
Says Rav Pincus, indeed all of this is intertwined and connected; Moshe and Ahahron’s Avodas Hamishkan would not have been possible without the foundational work done by Bnai Yisroel.
We therefore learn a most valuable lesson in Hakoras Hatov from this: In the same way we show Hakoras Hatov to Hashem by making a Brocho before and a Brocho after-for all the Chasodim He does for us; so too are we required to show Hakoras Hatov to those of our friends, family, and work colleagues that do us a favor by saying “Thank You” twice: Once before the favor is done and then after the favor has been completed. Chazal tells us that failure to acknowledge the good done for us by our friends, family, and acquaintences will ultimately lead to deny and ignore the good Hashem does for us.
Showing Hakoras Hatov before and after receiving a Chesed is the foundation of Yahadus and brings Sholom (Peace), Satisfaction, and Happiness.