Sayyiduna Jabir (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) said: "There is nothing between a servant and shirk or disbelief except abandoning the prayer." Imam Darimi (may Allah have mercy on him) said: Whoever abandons the prayer without excuse or reason, it will be said about him that there is disbelief with him, and it will not be said that he has become a disbeliever.
Hadith Referenceسنن دارمي / من كتاب الصللاة / 1267