Jeremiah 2:30

your children not literally such, nor yet young men slain in battle, but equivalent to the frequent expression "children of thy people" (e.g. Ezekiel 3:11; Ezekiel 33:2; Ezekiel 33:12; Ezekiel 33:17; Ezekiel 33:30), i.e. the people considered individually, as contrasted with the aggregate.

your prophets Some commentators make the reference to be to such events as those recorded in 1 Kings 18:4-13, or to some unknown outbreak of violence. But the passage may well point to the comparatively recent massacres by Manasseh, traditionally including Isaiah (Isaiah 21:16).