Why is the angel of the LORD asking the question? For Zechariah’s benefit. He knows already. In the vision Christ is shown as our mediator – asking the question on man’s behalf. Zechariah is shown new concepts here which he is to teach the people. First, they must put the word of God above everything; second, there is someone who intercedes for the people of God – the Son of God. The people of God can be blessed because this angel intercedes for them: that is a novel teaching for the Jews. The angel of the LORD prays to the Father for blessing on the church – a divine intercession is needed. What great encouragement it is to us that Christ, our intercessor, sees our true needs and expresses them more clearly than we could, and that his voice obtains the answer of our heavenly Father!