This shall be the bitterness at the end; they had rejected the warnings of the prophets (Amos 7:12, etc.); now the Word of God and the light of his teaching should fail them. Famine. When the light of God's revelation is withdrawn, their longing for the Word, however sore and great, shall remain unsatisfied, like that of Saul (1 Samuel 28:6).
They may grieve like the psalmist, "We see not our signs; there is no more any prophet; neither is there among us any that knoweth how long" (Psalms 74:9); but it will be in vain (see a similar punishment threatened, Lamentations 2:9; Ezekiel 7:26; Micah 3:7).