Daniel 12:10-12

Amplified Bible

¹⁰Many will be purged, purified (made white) and refined, but the wicked will behave wickedly. None of the wicked shall understand, but those who are [spiritually] wise will understand.^(A) ¹¹From the time that the regular sacrifice [that is, the daily burnt offering] is taken away and the abomination of desolation is set up [ruining the temple for worship of the true God], there will be ^[a]1,290 days.^(B) ¹²How blessed [happy, fortunate, spiritually prosperous] and beloved is he who waits expectantly [enduring without wavering for the period of tribulation] and comes to the ^[b]1,335 days!

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Footnotes

Daniel 12:11 1,290 is 30 days more than 3 1/2 years of 360 day years (1,260 days). The extra 30 days allows for the judgment that will take place after the second coming of Christ.
Daniel 12:12 The difference between this number and that in v 11 is 45 days, an interval that is not explained. The ancient rabbis speculated that when the Messiah comes, He will lead Israel into the wilderness and then disappear for 45 days to test their faith. The true believers will wait for Him, the rest will join other nations and eventually die there.