عن جابر قال: قال رسول الله صلى الله عليه وسلم: بين العبد وبين الكفر ترك الصلاة (سنن الترمذي الرقم: 2620)

Hazrat Jaabir (radhiyallahu ‘anhuma) reports that Rasulullah (sallallahu ‘alaihi wasallam) said, “Neglecting salaah is (the dividing factor) between the servant and his getting involved in kufr (i.e. neglecting salaah is the bridge that will lead one to eventually falling into kufr).”