Hadithcore
Riyad as-Salihin, 1457

'Uthman bin 'Affan (May Allah be pleased with him) reported:

The Messenger of Allah (ﷺ) said, "He who recites three times every morning and evening: 'Bismillahil-ladhi la yadurru ma'as-mihi shai'un fil-ardi wa la fis-sama'i, wa Huwas-Sami'ul-'Alim (In the Name of Allah with Whose Name there is protection against every kind of harm in the earth or in the heaven, and He is the All-Hearing and All- Knowing),' nothing will harm him." <b>[Abu Dawud and At- Tirmidhi]</b>.

وعن عثمان بن عفان رضي الله عنه قال‏:‏ قال رسول الله صلى الله عليه وسلم‏:‏ ‏

‏ما من عبد يقول في صباح كل يوم ومساء كل ليلة‏:‏ بسم الله الذي لا يضر مع اسمه شيء في الأرض ولا في السماء وهو السميع العليم، ثلاث مرات، إلا لم يضره شيء‏

‏‏.‏ رواه أبو داود والترمذي وقال حديث حسن صحيح ‏.‏

References1 variant
In-Book Reference
Book 15, Hadith 50
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) Seeking blessings through mentioning Allah’s name protects one from all harms by the permission of Allah Almighty.<br> 2) Perfect compliance with the guidance of the Prophet (may Allah’s peace and blessings be upon him) necessitate abiding by the reported number of times for reciting a certain Dhikr. Any increase or reduction of the reported number of times is impermissible unless there is Shariah evidence proving it.<br> Important Note:<br> There is a small booklet entitled 'Al-Hisn Al-Hasin' that is widely spread among some communities, and it is sometimes placed in cars and shops. This booklet involves many Shariah violations as it includes denounced matters. For example, it is mentioned in its introduction that whoever reads it is as if he has read the divinely-revealed books, or that whoever recites the last two verses of Surat al-Tawbah will not die on that day, and other similar strange claims that are neither sound nor authentic reports. More astonishingly, the author attributes these false reports by saying: “We were told by a person knowledgeable of Allah who narrates from his father who narrates from his grandfather!!” At the end of the booklet, there are stand-alone letters and incomprehensible words that resemble talismans and sorcerers’ writings. Thus, a believer should beware of hanging or spreading this booklet; rather, he should hasten to destroy it. Indeed, all good lies in the authentic guidance of the Prophet (may Allah’s peace and blessings be upon him) to regularly recite the above-mentioned Dhikr included in the Hadiths authentically-transmitted from him. {There has come to you a Messenger from among yourselves; he is grieved by your suffering, and is concerned for you, and is gracious and merciful towards the believers.} Also, the Prophet (may Allah’s peace and blessings be upon him) said: “Indeed, I am but a gift of mercy.” Meaning: I am mercy and guidance for you.