Isaiah 22:13

Instead of this the people rush to drown reflection in riotous festivities. The immediate occasion of the revelry was no doubt a great sacrifice of thanksgiving to Jehovah for their unexpected deliverance, but this only rendered their irreligious spirit more detestable to Jehovah (cf. Isaiah 1:10-17).

for to morrow we shall die Cf. 1 Corinthians 15:32. Probably a current proverb. But the revellers may very well have been conscious that their escape had only procured for them a precarious respite. And in the next verse Isaiah assures them that they shalldie.