The Ruling on sitting with One Who abandons Prayer
Question :
Is it permissible to sit with one who does not pray?
Answer:
Whoever deliberately abandons prayer, denying its obligation, is a disbeliever according to the consensus of opinion of the scholars. And if he abandons it due to negligence and laziness, he is (also) a disbeliever, according to the most authoritative opinion of the scholars. Based upon this, it is not permissible to sit with them; rather, it is incumbent to avoid them and cut off relations with them, after explaining to them that abandoning it is an act of disbelief, if they are ignorant of this. And it has been authentically reported from the Prophet that he said:
The covenant which is between us and them is the prayer, and whoever abandoned it, has disbelieved.
This Hadith is covers the one who rejects its obligation and the one who abandons it due to laziness. And through Allah is attained success. And may peace be upon our Prophet, Muhammad and upon his family.
Source:
The Permanent Committee
Fatawa Islamiyah, Vol. 2 Pages 373-374