'Dost' in the Bible

But when I saw that they are not walking uprightly to the truth of the good news, I said to Peter before all, 'If thou, being a Jew, in the manner of the nations dost live, and not in the manner of the Jews, how the nations dost thou compel to Judaize?

For it is written, "Rejoice, thou barren woman that bearest not, break forth into a joyful cry, thou that dost not travail with child. For the desolate woman has many children--more indeed than she who has the husband."