shall be. Supply Ellipsis (App-6) thus: "[shall offer] themselves for voluntary offerings, in the day that Thou warrest".
willing. freewill offerings, as in Exodus 35:29; Exodus 36:3. 1Ch 29:9, 1 Chronicles 29:14; 1 Chronicles 29:17; Ezra 3:5; Ezra 8:28.
the beauties of holiness. Some codices, with two early printed editions, read "in (or on) the holy mountains".
from the womb, &c. Supply Ellipsis (App-6): "[as the dew] from the womb before the morning. have begotten thee [a son]". Compare Psalms 2:7. There should be no stop after the word "morning".
youth. a son.