صحيح البخاري
Sahih Bukhari
كتاب الاستئذان
The Book of Asking Permission
باب كل لهو باطل إذا شغله عن طاعة الله:
Chapter. Every Lahw (amusement, idle talk, etc.) or deed that diverts one from fulfilling one’s obedience (duties) towards Allah, is Batil [falsehood (disbelief, etc.)].