If ye have faith; the reference here is to that faith with which Christ, in the case of the apostles, connected the working of miracles.

Nothing shall be impossible; no exercise of miraculous power, however great, that may be needful in the prosecution of your apostolic work. The spirit of this promise applies to all Christ's servants in all ages. No hinderance to their work can be so great that faith cannot overcome it. Had men higher views of Christ, greater confidence in him, and more entire devotion to his service, they might receive much more good themselves, and be instrumental of much greater good to others.

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Old Testament