2 Kings 5:13

And his servant came near, and spake unto him, and said, my father,.... Or my lord, as the Targum; this being not a familiar and affectionate expression, but a term of honour, reverence, and submission:if the prophet had bid thee do some great thing, wouldest thou not have done it?

something that was hard and difficult to done, or painful to bear, to go through some severe operation, or disagreeable course of physic:how much rather then when he saith to thee, wash, and be clean?