The Prophet ﷺ commanded us to do seven things and forbade us from seven. He commanded us to follow funeral processions, visit the sick, accept invitations, support the wronged, fulfill oaths, return greetings of peace, and respond to the one who sneezes. The hadith continues.
أمرنا النبي ﷺ بسبع ونهانا عن سبع: أمرنا باتباع الجنائز، وعيادة المريض، وإجابة الداعي، ونصر المظلوم، وإبرار القسم، ورد السلام، وتشميت العاطس… الحديث.
Bukhari narrated it in the Book of Funerals (1239) and Muslim in the Book of Clothing and Adornment (3:2066), both through Ashath bin Abu Shatha, who said, "I heard Muawiya bin Suwayd bin Muqarin, from Bara," and he related it. The wording given is Bukhari's, and Muslim added, "or the one who distributes."