Bikur Cholim

The essence of the mitzvah to visit the sick is to determine the needs of the patient to see what has to be done for him, and to make him comfortable with his friends. You must also bear in mind to pray for mercy on his behalf. If you visited him and did not pray for his recovery, you have not fulfilled the mitzvah.

(Kitzur Shulchan Aruch 193:3)