Narrated Abu Hurairah:
that the Messenger of Allah (ﷺ) said: “There are six things due from the believer to another believer: Visiting him when he is ill, attending (his funeral) to him when he dies, accepting his invitation when he invites, giving him Salam when he meets him, replying to him when he sneezes, and wishing him well when he is absent and when he is present.”
: Hasan (Darussalam)
: Vol. 5, Book 41, Hadith 2737
: Book 43, Hadith 2956
These duties require just a little effort. We all should have this in our minds fixed.