'Dost' in the Bible

Better that thou do not vow, than that thou dost vow and dost not complete.

Say not thou, What is the cause that the former days were better than these? for thou dost not inquire wisely concerning this.

Do not much wrong, neither be thou a fool, why dost thou die within thy time?

It is good that thou dost lay hold on this, and also, from that withdrawest not thy hand, for whoso is fearing God goeth out with them all.

Where the word of a king is power is, and who saith to him, 'What dost thou?'

Send forth thy bread on the face of the waters, For in the multitude of the days thou dost find it.