عن بريدة رضي الله عنه قال: قال رسول الله صلى الله عليه وسلم:
«إِنَّ الْعَهْدَ الَّذِي بَيْنَنَا وَبَيْنَهُمُ الصَّلَاةُ، فَمَنْ تَرَكَهَا فَقَدْ كَفَرَ».
[صحيح] - [رواه الترمذي والنسائي وابن ماجه وأحمد] - [سنن النسائي: 463]
المزيــد ...
Buraydah (may Allah be pleased with him) reported: The Messenger of Allah (may Allah’s peace and blessings be upon him) said:
"The covenant between us and them is prayer; so, whoever abandons it has disbelieved."
[Authentic hadith] - [Narrated by At-Termedhy & An-Nasa'i & Ibn Majah & Ahmad] - [Sunan of An-Nasa'i - 463]
The Prophet (may Allah's peace and blessings be upon him) pointed out that the covenant and pledge between the Muslims and the disbelievers and hypocrites is prayer. So, whoever abandons it has become a disbeliever.