'Dost' in the Bible

"Now, O Sovereign Lord, Thou dost send Thy servant away in peace, in fulfilment of Thy word,

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."

But, as we know, a writer has solemnly said, "How poor a creature is man, and yet Thou dost remember him, and a son of man, and yet Thou dost come to him!

And now in loud voices they cried out, saying, "How long, O Sovereign Lord, the holy One and the true, dost Thou delay judgment and the taking of vengeance upon the inhabitants of the earth for our blood?"