Sayyiduna Jabir bin Abdullah (may Allah be pleased with him) heard the Prophet (peace and blessings be upon him) say: "When a man mentions Allah upon entering his house and says 'Bismillah' (In the name of Allah) at his meal, Shaytan says (to his companions): 'There is no place for you to spend the night and no supper.' When he enters his house and does not mention Allah upon entering, Shaytan says: 'You have found a place to spend the night,' and when he does not say 'Bismillah' (In the name of Allah) at his meal, Shaytan says: 'You have found both a place to spend the night and supper.'"
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصداق / 14607