Liturgy על יחזקאל 33:4

4) The shofar brings to mind the warnings and exhortations of the prophets which are likened to the blasts of the shofar, as it is said, וְשָׁמַע הַשֹׁמֵעַ אֶת קוֹל הַשׁוֹפָר וְלֹא נִזְהָר וַתָּבוֹא חֶרֶב וַתִּקָּחֵהוּ דָמוֹ בְּרֹאשׁוֹ יִהְיֶה ... וְהוּא נִזְהָר נַפְשׁוֹ מִלֵט. He who hears the sound of the shofar and does not take warning, the sword come ands takes him away, his blood will be upon his own head ... but he who heeds warning will save his soul. (Yechezkel 33:4,5).