He who davens for his fellow will be answered first.
If a person has a choleh in his house, he should go to a chacham and request that the chacham should daven for the choleh.
Reason: When a chacham hears that a Jew is sick, the chacham is pained and is not able to learn so well. So Hashem will heal the choleh so that the chacham should not be pained.