Lay down now; or, give now a pledge (see the Revised Version). The terms used in this verse are law terms. Job calls upon God to go into court with him, and, first of all, to deposit the caution-money which the court will require before it undertakes the investigation of the case.
Next, he goes on to say, put me in a surety with thee; or rather (as in the Revised Version), be surety for me with thyself' which is either the same thing with giving a pledge, or a further legal requirement.
Finally, he asks the question, Who is he that will strike hands with me? meaning, "Who else is there but thyself, to whom I can look to be my surety, and by striking hands (comp. Proverbs 6:1) with me to accept the legal responsibility?"
As Dr. Stanley Leathes says, "It is wonderful the way in which the language of Job fits in with what we have since and elsewhere learnt concerning the Persons in the Godhead."