Sahih al-Bukhari 6320

قَالَ النَّبِيُّ صلى الله عليه وسلم ‏ "‏ إِذَا أَوَى أَحَدُكُمْ إِلَى فِرَاشِهِ فَلْيَنْفُضْ فِرَاشَهُ بِدَاخِلَةِ إِزَارِهِ، فَإِنَّهُ لاَ يَدْرِي مَا خَلَفَهُ عَلَيْهِ، ثُمَّ يَقُولُ بِاسْمِكَ رَبِّ وَضَعْتُ جَنْبِي، وَبِكَ أَرْفَعُهُ، إِنْ أَمْسَكْتَ نَفْسِي فَارْحَمْهَا، وَإِنْ أَرْسَلْتَهَا فَاحْفَظْهَا بِمَا تَحْفَظُ بِهِ عِبَادَكَ الصَّالِحِينَ ‏"‏‏.

“The Prophet ﷺ said, "When anyone of you go to bed, he should shake out his bed with the inside of his waist sheet, for he does not know what has come on to it after him, and then he should say: 'Bismika Rabbi Wada`tu Janbi wa bika arfa'uhu, In amsakta nafsi farhamha wa in arsaltaha fahfazha bima tahfazu bihi ibadakas-salihin”