These two chapters were specifically revealed to Prophet Muhammad (ﷺ) to shield him from and cure the effects of black magic. In one well-known account, the Prophet (ﷺ) was afflicted by magic involving knots; as he recited each verse of these two surahs, the knots were miraculously untied until he was completely healed. After their revelation, he relied on them primarily for protection and ceased using other previous methods.
Surah Al-Falaq and Surah An-Naas, collectively known as the (the two surahs of seeking refuge), are widely regarded as the most powerful Quranic remedies for protection against black magic, the evil eye, and spiritual harm. Historical Significance surah-falaq-and-naas-for-black-magic
Following the Sunnah (the practice of the Prophet ﷺ) is considered the most effective way to utilize these surahs for spiritual safety: These two chapters were specifically revealed to Prophet