What, my son? and what, the son of my womb? and what, the son of my vows? What, my son? - The Chaldee בר bar is used twice in this verse, instead of the Hebrew בן ben, son. This verse is very elliptical; and commentators, according to their different tastes, have inserted words, indeed some of them a whole sentence, to make up the sense. Perhaps Coverdale has hit the sense as nearly as any other: "These are the wordes of Kynge Lemuel; and the lesson that his mother taughte him. My sonne, thou son of my body, O my deare beloved sonne!"
The son of my vows? - A child born after vows made for offsprings is called the child of a person's vows.