'Didst' in the Bible

And Joab saith to the man who is declaring it to him, 'And lo, thou hast seen -- and wherefore didst thou not smite him there to the earth -- and on me to give to thee ten silverlings and one girdle?'

and it cometh to pass, when he hath come to Jerusalem to meet the king, that the king saith to him, 'Why didst thou not go with me, Mephibosheth?'