Abu Huraira reported that Allah's Messenger (ﷺ) used to command us that as we go to our bedo, we should utter the words (as mention- ed above) and he also said (these words):" From the evil of every animal, Thou hast hold upon its forelock (Thou bast full control over it)."
وَحَدَّثَنِي عَبْدُ الْحَمِيدِ بْنُ بَيَانٍ الْوَاسِطِيُّ، حَدَّثَنَا خَالِدٌ، - يَعْنِي الطَّحَّانَ - عَنْ سُهَيْلٍ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يَأْمُرُنَا إِذَا أَخَذْنَا مَضْجَعَنَا أَنْ نَقُولَ . بِمِثْلِ حَدِيثِ جَرِيرٍ وَقَالَ " مِنْ شَرِّ كُلِّ دَابَّةٍ أَنْتَ آخِذٌ بِنَاصِيَتِهَا " .
Muslim
The Book Pertaining to the Remembrance of Allah, Supplication, Repentance and Seeking Forgiveness • Hadith 83