Albert Barnes Commentary Matthew 15:23

"But he answered her not a word. And his disciples came and besought him, saying, Send her away; for she crieth after us." — Matthew 15:23 (ASV)

But he answered her not a word. This was done to test her faith, and to exhibit to the apostles an example of the effect of persevering supplication. The result shows that it was not unwillingness to aid her, or neglect of her. It was proper that the strength of her faith should be fully tried.