The Prophet ﷺ sought refuge for himself and his grandsons with these words, and taught others to say them morning and evening.
بِسْمِ اللَّهِ الَّذِي لَا يَضُرُّ مَعَ اسْمِهِ شَيْءٌ فِي الْأَرْضِ وَلَا فِي السَّمَاءِ وَهُوَ السَّمِيعُ الْعَلِيمُ
Bismillāhil-ladhī lā yaḍurru maʿasmihī shayʾun fil-arḍi wa lā fis-samāʾi wa huwas-samīʿul-ʿalīm
In the name of Allah, with whose name nothing on earth or in the heavens can cause harm, and He is the All-Hearing, the All-Knowing.
Sunan Abi Dawud 5088; Jami at-Tirmidhi 3388, graded hasan sahih
أَعُوذُ بِكَلِمَاتِ اللَّهِ التَّامَّاتِ مِنْ شَرِّ مَا خَلَقَ
Aʿūdhu bi-kalimātillāhit-tāmmāti min sharri mā khalaq
I seek refuge in the perfect words of Allah from the evil of what He has created.
Sahih Muslim 2708, 2709
أُعِيذُكَ بِكَلِمَاتِ اللَّهِ التَّامَّةِ، مِنْ كُلِّ شَيْطَانٍ وَهَامَّةٍ، وَمِنْ كُلِّ عَيْنٍ لَامَّةٍ
Uʿīdhuka bi-kalimātillāhit-tāmmah, min kulli shayṭānin wa hāmmah, wa min kulli ʿaynin lāmmah
I seek protection for you in the perfect words of Allah, from every devil and harmful creature, and from every evil eye. (Said over a child; say u'idhuki for a girl.)
Sahih al-Bukhari 3371
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Guide
The Prophet ﷺ sought refuge for himself and his grandsons with these words, and taught others to say them morning and evening.
Recite Ayat al-Kursi, and Al-Ikhlas, Al-Falaq and An-Nas three times, morning and evening. The Prophet ﷺ said these suffice you against everything.1 If you admire something, say "Barakallahu fih" so your look does not harm it.
Questions
U'idhuka bi-kalimatillahit-tammah, min kulli shaytanin wa hammah, wa min kulli aynin lammah (Bukhari 3371).
Ayat al-Kursi and the three Quls: Al-Ikhlas, Al-Falaq and An-Nas.