'Preserve' in the Bible

Come, let us make our father drink wine, and we will lie with him, that we may preserve seed of our father.

And it came to pass on the morrow, that the firstborn said unto the younger, Behold, I lay yesternight with my father: let us make him drink wine this night also; and go thou in, and lie with him, that we may preserve seed of our father.

Now therefore be not grieved, nor angry with yourselves, that ye sold me hither: for God did send me before you to preserve life.

And God sent me before you to preserve you a posterity in the earth, and to save your lives by a great deliverance.