This is the last article in the chapter Probable Enormities from the classical manual on Sharia called Reliance of the Traveller. The articles are posted one by one in the order they are given in the book.
NOT LOVING ONE’S FELLOW MUSLIMS
p75.28 The Prophet (Allah bless him and give him peace) said:
“By Him in whose hand is my soul, none of you will enter paradise until you believe, and none of you will believe until you love each other. Shall I not tell you of something which if you do it will create love among you? Increase the custom of greeting each other with ‘as-Saдamu ‘alaykum.’ ” (Kitab al-kaba’ir wa tabyin al-maharim (y36),35-181)
p76.0 (n: Most of the above enormities are agreed upon by all four schools of jurisprudence. A more comprehensive list by Ibn Hajar Haytami is given below at w52.)