1 Kings 8:37-39:

If there be in the land famine, if there be pestilence, blasting, mildew or locust, or if there be caterpiller; if their enemy besiege them in the land of their cities; whatsoever plague, whatsoever sickness there be;
What prayer and supplication soever be made by any man, or by all thy people Israel, which shall know every man the plague of his own heart, and spread forth his hands toward this house:
Then hear thou in heaven thy dwelling place, and forgive, and do, and give to every man according to his ways, whose heart thou knowest; (for thou, even thou only, knowest the hearts of all the children of men;)

Notes on 1 Kings 8:37-39:

Here Solomon shows his expectation that the sick in Israel should be able to pray and have their sickness removed.  He expected people to be able to pray for this themselves rather than to have to go to a priest or someone else.  This is an expectation we should have today.  The main difference is that today we pray to receive the healing that is already legally ours in Christ; we don’t have to beseech God to heal us by prayer and supplication.  We have a better covenant than the one Solomon had.