When calculating the number of Sabbath days in the 6,000 years and adding the fact that the 1,000-year interval before the advent of עולם הבא is composed only of Sabbath days we get a total of 600,000 Sabbath days, or the same number as the number of the Jewish souls which experienced the Revelation and the building of the Tabernacle. This number also equals the number of letters the Torah is made up of.
They are also an allusion to the tradition that this universe will continue for 6,000 years before it will experience a metamorphosis of 1,000 years after which the עולם הבא (next world) will be ushered in. The 1,000-year interval symbolizes the concept of the Sabbath.
But don’t forget this one thing, loved ones—that with Yahweh one day is like a thousand years, and a thousand years like one day. Yahweh is not slow in keeping His promise, as some consider slowness. Rather, He is patient toward you—not wanting anyone to perish, but for all to come to repentance. But the Day of Yahweh will come like a thief. On that day, the heavens will pass away with a roar and the elements will melt in fervent heat, and the earth and all its works will be exposed.
