In Hebrew the word ‘mishkan’ (משכן) – Tabernacle – has a numerical value of 410. It is equal to the number of years that the first Beit ha-Mikdash (the Temple) stood in Jerusalem (410).
The word ‘ha-mishkan’ (המשכן) – the Tabernacle – has a numerical value of 420. This value is calculated by summing up 410 with the numerical value of letter ‘hey’ (5) and the number of letters in the word ‘ha-mishkan’ (5). The second Beit ha-Mikdash in Jerusalem stood for 420 years.
The word ‘ha-edut’ (העדת) – Testimony – equals 479. This number is an allusion to the 479 years of the Mishkan’s work – from the year it was constructed in the desert and until Shlomo ha-Meleh opened the door of the First Beit ha-Mikdash.
All three words occur at the beginning of the weekly chapter “Pekudei”:
“These are the numbers of the Mishkan, the Mishkan of the Testimony, which were counted at Moses’ command; [this was] the work of the Levites under the direction of Ithamar, the son of Aaron the Kohen”. (Shmot, 38:21)
Rashi points out in his commentary to this verse:
“[The word משכן is written] twice. This alludes to the Temple, which was taken as security (משכון) by the two destructions, for Israel’s iniquities. [The translator’s note: The Temples were taken as a collateral for Israel’s sins. When Israel fully repents, the Third Temple will be built]. (Rashi on Shmot, 38:21; from Midrash Tanchuma 2, Exod. Rabbah 51:3).
Based on the commentary of Rabbeinu Bachya.