'Abdullah bin Buraidah narrated that his father said:
"TheMessengerof Allah (ﷺ) said: 'The covenant that distinguishesbetween us andthem is prayer; so whoever leaves it, he has committedKufr.'" (JA)
English reference (JA): Vol. 1, Book 5, Hadith 1079 (JA)
Arabic reference (JA): Book 5, Hadith 1132 (JA)