וַיֵּרָ֤א אֵלָיו֙ יְהֹוָ֔ה בְּאֵלֹנֵ֖י מַמְרֵ֑א וְה֛וּא יֹשֵׁ֥ב פֶּֽתַח־הָאֹ֖הֶל כְּחֹ֥ם הַיּֽוֹם׃
ואמר רבי חמא ברבי חנינא מאי דכתיב (דברים יג, ה) "אחרי ה' אלקיכם תלכו"?... הקב"ה ביקר חולים דכתיב (בראשית יח, א) וירא אליו ה' באלוני ממרא
And Rabbi Ḥama, son of Rabbi Ḥanina, says: What is the meaning of that which is written: “After the Lord your God shall you walk, Just as the Holy One, Blessed be He, visits the sick, as it is written with regard to God’s appearing to Abraham following his circumcision: “And the Lord appeared unto him by the terebinths of Mamre” (Genesis 18:1), so too, should you visit the sick. Just as the Holy One, Blessed be He,
אמר מר (אשר) ילכו זה ביקור חולים היינו גמילות חסדים לא נצרכה אלא לבן גילו דאמר מר בן גילו נוטל אחד מששים בחליו ואפי' הכי מבעי ליה למיזל לגביה
the Master said: When one who is a contemporary of an ill person visits him, he takes one-sixtieth of his illness. Since visiting an ill contemporary involves contracting a bit of his illness, a special derivation is necessary to teach that even so, he is required to go and visit him.
אֵלּוּ דְבָרִים שֶׁאָדָם אוכֵל פֵּרותֵיהֶם בָּעולָם הַזֶּה וְהַקֶּרֶן קַיֶּמֶת לו לָעולָם הַבָּא. וְאֵלּוּ הֵן. כִּבּוּד אָב וָאֵם. וּגְמִילוּת חֲסָדִים. וְהַשְׁכָּמַת בֵּית הַמִּדְרָשׁ. שַׁחֲרִית וְעַרְבִית. וְהַכְנָסַת אורְחִים. וּבִקּוּר חולִים. וְהַכְנָסַת כַּלָּה. וּלְוָיַת הַמֵּת. וְעִיּוּן תפילה. וַהֲבָאַת שָׁלום בֵּין אָדָם לַחֲבֵרו וּבֵין אִישׁ לְאִשְׁתּו. וְתַלְמוּד תּורָה כְּנֶגֶד כֻּלָּם:
These are the deeds that yield immediate fruit in This World and continue to yield fruit in the World to Come: honoring parents; doing deeds of lovingkindness; arriving the house of study early--morning and evening; providing hospitality; visiting the sick; helping the needy bride; attending to the dead; probing the meaning of prayer; making peace between one person and another, and between husband and wife. And the study of Torah outweighs them all.
תניא ביקור חולים אין לה שיעור מאי אין לה שיעור סבר רב יוסף למימר אין שיעור למתן שכרה אמר ליה אביי וכל מצוות מי יש שיעור למתן שכרן והא תנן (משנה אבות ב א) הוי זהיר במצוה קלה כבחמורה שאין אתה יודע מתן שכרן של מצוות אלא אמר אביי אפילו גדול אצל קטן רבא אמר אפילו מאה פעמים ביום
א"ל רבי החייתני יצא ר' עקיבא ודרש כל מי שאין מבקר חולים כאילו שופך דמים
the Gemara states: It is taught in a baraita: The mitzva of visiting the ill has no fixed measure. The Gemara asks: What is the meaning of: Has no fixed measure? Rav Yosef thought to say: There is no fixed measure for the granting of its reward. Abaye said to him: And do all other mitzvot have a fixed measure for the granting of their reward? There is no fixed measure for the disparity between the ill person and his visitor, as even a prominent person pays a visit to a lowly person and should not say that doing so is beneath a person of his standing. Rava said: There is no fixed measure for the number of times that one should visit the ill, as even one hundred times a day is appropriate. The Gemara relates:
With regard to anyone who does not visit the ill, it is as though he is spilling blood, as it could be that the sick person has no one to care for him. If there are no visitors, no one will know his situation and therefore no one will come to his aid.
אמר רב שישא בריה דרב אידי לא ליסעוד איניש קצירא לא בתלת שעי קדמייתא ולא בתלת שעי בתרייתא דיומא כי היכי דלא ליסח דעתיה מן רחמי תלת שעי קדמייתא רווחא דעתיה בתרייתא תקיף חולשיה
Rav Sheisha, son of Rav Idi, said: Let one not visit a sick person, neither during the first three hours of the day, nor in the last three hours of the day, so that he will not be diverted from praying for mercy. Rav Sheisha elaborates: During the first three hours the sick person is relieved, as after a night’s sleep his suffering is somewhat alleviated and the visitor will conclude that there is no need for prayer. In the last three hours of the day his weakness is exacerbated, and the visitor will despair of ameliorating his suffering and will conclude that prayer is futile.
תניא נמי הכי הנכנס לבקר את החולה לא ישב לא על גבי מטה ולא ע"ג ספסל ולא על גבי כסא אלא מתעטף ויושב ע"ג קרקע מפני שהשכינה שרויה למעלה ממטתו של חולה שנאמר ה'' יסעדנו על ערש דוי
The Gemara notes that this is also taught in a baraita: One who enters to visit a sick person may neither sit on the bed nor sit on a bench or on a chair that is higher than the bed upon which the sick person is lying. Rather, he deferentially wraps himself in his garment and sits on the ground, because the Divine Presence is resting above the bed of the sick person, as it is stated: “The Lord will support him upon the bed of suffering,” and it is inappropriate for one to sit above the place where the Divine Presence rests.
מתי מבקרין החולה ואיזה חולים מבקרין וכיצד מתפללין עליו. ובו י' סעיפים:
מצוה לבקר חולים
LAWS OF VISITING THE SICK; HEALING; THE APPROACH OF DEATH AND ONE IN A DYING CONDITION.
It is a religious duty to visit the sick.
A Kohen is permitted to visit a sick person in a hospital, although it is quite likely that a corpse is present there. However, he should first make inquiries from the hospital authorities whether there is a corpse there or not. Where this is impossible to be determined, the Kohen may visit the patient in order to fulfil the religious duty of visiting the sick. The Kohen should not fear that there are sick people in the hospital who are in a dying condition, for we apply the principle that the majority of sick people recover — Resp. Teshurath Shai.
The Mitzvah of Bikur Cholim, Rav Soloveitchik
Healing is not merely a remedy for the physical body, Refu’at Ha’Guf, but healing must also incorporate the mental, emotional and spiritual aspect, Refu’at HaNefesh, of the patient. A patient with serious mental concerns and anxieties about parnassa [paying his bills] or about other illnesses and problems in his family, will find it difficult to have a complete Refu’at HaGuf. Avraham had not only the physical ailment from his Brit Milah but he also suffered the anxieties of concern for the safety of his nephew Lot.
Scientific Faith:
In a recent scientific research it was proven & shown that visiting a patient enhances the immune system of the visitor because the human immune system is so sensitive towards what it feels or believes. And visiting a sick person & checking on him strengthens this system.