'Shouldst' in the Bible

That You should seek for my guiltAnd search after my sin?

If You, Lord, should mark iniquities,O Lord, who could stand?

and said, "If you are God's Son, throw yourself down; for it is written, "'To His angels He will give orders concerning thee, and on their hands they shall bear thee up, lest at any moment thou shouldst strike thy foot against a stone.'"

and 'On their hands they shall bear thee up, Lest at any moment thou shouldst strike thy foot against a stone.'"

And now they sing a new song. "It is fitting," they say, "that Thou shouldst be the One to take the book And break its seals; Because Thou hast been offered in sacrifice, And hast purchased for God with Thine own blood Some out of every tribe and language and people and nation,