'Shouldest' in the Bible

and Jehovah hath avouched thee this day to be a people for his own possession, as he hath promised thee, and that thou shouldest keep all his commandments;

It is not in heaven, that thou shouldest say, Who shall go up for us to heaven, and bring it unto us, and make us to hear it, that we may do it?

Neither is it beyond the sea, that thou shouldest say, Who shall go over the sea for us, and bring it unto us, and make us to hear it, that we may do it?