O altar, altar. Figures of speech Apostrophe and Epizeuxis.
child = son.
Josiah by name. Cyrus is the only other so foretold (177 years before). Josiah knew (2Ki_23:17, 2Ki_23:18). Cyrus knew (2Ch_36:22, 2Ch_36:23. Isa_44:28).
offer (in sacrifice) = slay, or slaughter. App-43.
men's: human. Hebrew. 'adam. App-14.
shall be. This was fulfilled in 2Ki_23:16 (360 years later).