Isaiah 22:13

However, they would not repent but rejoice in their apparent security, believing that if they could not save themselves, nothing else could (cf. Revelation 9:20-21). Isaiah saw in the present rejoicing over security (Isaiah 22:1-2 a) the same attitude of self-sufficiency that would doom the Jerusalemites in the future.

Normally ancient Near Easterners used cattle and sheep for producing milk and wool; they did not slaughter them to eat very often because these animals produced valuable products. Killing them to eat, therefore, expresses the people’s utter despair and their self-indulgence, thinking there was no future left for them (cf. 1 Corinthians 15:32).