'Dost' in the Bible

If thou dost go up high as an eagle, And if between stars thou dost set thy nest, From thence I bring thee down, An affirmation of Jehovah.

And -- thou dost not look on the day of thy brother, On the day of his alienation, Nor dost thou rejoice over sons of Judah, In the day of their destruction, Nor make great thy mouth in a day of distress.