(35) باب بَيَانِ إِطْلاَقِ اسْمِ الْكُفْرِ عَلَى مَنْ تَرَكَ الصَّلاَةَ
It is narrated on the authority of Abu Zubair that he heard Jabir b. 'Abdullah saying. I heard the Messenger of Allah (may peace and blessings be upon him) observing this:
Between man and polytheism and unbelief is the abandonment of salat.
Reference: Sahih Muslim 82 b
In-book reference: Book 1, Hadith 154
USC-MSA web (English) reference(deprecated numbering scheme): Book 1, Hadith 147