When a man enters his house and mention Allah’s name on entering and on his food, the devil says: You have no place to spend the night and no evening meal; but when he enters without mentioning Allah’s name on entering, the devil says: You have found a place to spend the night, and when he does not mention Allah’s name at his food, he says: You have found a place to spend the night and an evening meal. (Using translation from Abū Dāʾūd 3765)   

أَنَّهُ سَمِعَ النَّبِيَّ ﷺ يَقُولُ إِذَا دَخَلَ الرَّجُلُ بَيْتَهُ فَذَكَرَ اللهَ عِنْدَ دُخُولِهِ وَعِنْدَ طَعَامِهِ قَالَ الشَّيْطَانُ لَا مَبِيتَ لَكُمْ وَلَا عَشَاءَ وَإِذَا دَخَلَ فَلَمْ يَذْكُرِ اللهَ عِنْدَ دُخُولِهِ قَالَ الشَّيْطَانُ أَدْرَكْتُمُ الْمَبِيتَ فَإِذَا لَمْ يَذْكُرِ اللهَ عِنْدَ طَعَامِهِ قَالَ أَدْرَكْتُمُ الْمَبِيتَ وَالْعَشَاءَ  

[Machine] The Messenger of Allah ﷺ used to eat with six of his companions. Then a hungry Bedouin came and he fed him with two morsels. The Prophet ﷺ said, "If he had mentioned the name of Allah, it would have sufficed you all. So when any of you eats, let him mention the name of Allah. And if he forgets to mention it at the beginning, then let him say 'Bismillah' (in the name of Allah) at the beginning and at the end." This is the wording of the Hadith of Ruwah ibn 'Ubada.  

رَسُولَ اللهِ ﷺ كَانَ يَأْكُلُ فِي سِتَّةٍ مِنْ أَصْحَابِهِ فَجَاءَ أَعْرَابِيٌّ جَائِعٌ فَأَكَلَهُ بِلُقْمَتَيْنِ فَقَالَ النَّبِيُّ ﷺ أَمَا إِنَّهُ لَوْ ذَكَرَ اسْمَ اللهِ لَكَفَاكُمْ فَإِذَا أَكَلَ أَحَدُكُمْ فَلْيَذْكُرِ اسْمَ اللهِ فَإِنْ نَسِيَ أَنْ يُسَمِّيَ فِي أَوَّلِهِ فَلْيَقُلْ بِسْمِ اللهِ أَوَّلَهُ وَآخِرَهُ لَفْظُ حَدِيثِ رَوْحِ بْنِ عُبَادَةَ