'Rigour' in the Bible

And the Egyptians made the children of Israel to serve with rigour:

And they made their lives bitter with hard bondage, in morter, and in brick, and in all manner of service in the field: all their service, wherein they made them serve, was with rigour.

Thou shalt not rule over him with rigour; but shalt fear thy God.

And ye shall take them as an inheritance for your children after you, to inherit them for a possession; they shall be your bondmen for ever: but over your brethren the children of Israel, ye shall not rule one over another with rigour.

And as a yearly hired servant shall he be with him: and the other shall not rule with rigour over him in thy sight.

The weak ye have not strengthened, And the sick one ye have not healed, And the broken ye have not bound up, And the driven away have not brought back, And the lost ye have not sought, And with might ye have ruled them and with rigour.