The Prophet (ﷺ) used this dua to protect Hasan and Hussein (his grandchildren):
أُعِيْذُكُمَا بِكَلِمَاتِ اللَّهِ التَّامَّةِ مِنْ كُلِّ شَيْطَانٍ وَّهَامَّةٍ وَّمِنْ كُلِّ عَيْنٍ لَامَّةٍ
Transliteration
U'eethukumaa bikalimaatil-laahit-taammati min kulli shaytaanin wa haammah, wa min kulli 'aynin laammah
Translation
I seek protection for you in the Perfect Words of Allah from every devil and every beast, and from every envious blameworthy eye.
حَدَّثَنَا عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا جَرِيرٌ، عَنْ مَنْصُورٍ، عَنِ الْمِنْهَالِ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ قَالَ كَانَ النَّبِيُّ صلى الله عليه وسلم يُعَوِّذُ الْحَسَنَ وَالْحُسَيْنَ وَيَقُولُ " إِنَّ أَبَاكُمَا كَانَ يُعَوِّذُ بِهَا إِسْمَاعِيلَ وَإِسْحَاقَ، أَعُوذُ بِكَلِمَاتِ اللَّهِ التَّامَّةِ مِنْ كُلِّ شَيْطَانٍ وَهَامَّةٍ، وَمِنْ كُلِّ عَيْنٍ لاَمَّةٍ " .
Translation
Narrated Ibn `Abbas: The Prophet (ﷺ) used to seek Refuge with Allah for Al-Hasan and Al-Husain and say: "Your forefather (i.e. Abraham) used to seek Refuge with Allah for Ishmael and Isaac by reciting the following: 'O Allah! I seek Refuge with Your Perfect Words from every devil and from poisonous pests and from every evil, harmful, envious eye.' " [Bukhari: 3371]
Surah Muminun teaches us to ask Allah for maghfirat. This dua keeps your heart soft and Iman strong. Only Allah forgives and brings real peace.
Say U'eethukumaa bikalimaatil-laahit-taammati min kulli shaytaanin wa haammah, wa min kulli 'aynin laammah. This dua asks Allah for safety from devils, animals, and bad eyes.
Muslims read Surah Al-Falaq and Surah An-Nas for evil eye protection. They ask Allah to guard us from harm, jinn, and bad whispers. Read them every day for safety.
The last three surahs of the Quran protect from evil eye, jealousy, and magic. Say them in the morning, at night, before sleep, after prayers, and when sick for strong protection.
Read Surah Ikhlas, al-Mu'awwidhatayn, Surah Fatiha, and Ayat Al Kursi. These remove harm and help you feel better. Muslims say them often.
A well-known dua is Rabbi 'a`outhubika min hamazaatish-shayaateeni, wa 'a`outhu bika rabbi 'ay-yahdhuroon. It asks Allah to protect from shaitan's whispers and dangers.