The ‘Three Quls’ are the last three chapters (Surahs) in the Qur’an.
“Qul huwa Allāhu Aḥad” (Sūrah Al-Ikhlāṣ)
“Qul A'ūdhu birabbi al-falaq” (Sūrah Al-Falaq)
“Qul A'ūdhu birabbi al-nās” (Sūrah Al-Nās)
What applies to “Ayatul-Kursi” is applicable to the “Three Quls” in the ways and the times we recite them for protection. Thus, we recite each of them once, after each prayer (ṣalāh). We also recite them three times each, before going to bed.
Allah’s Messenger (ﷺ) slept on his bed, he put together his hands (as in the du’aa) and blew on it and recited (the surahs of) AI-Ikhlaas (Qul huwauahu ahad), AI-Falaq (Qul a’udhu birabbil falaq), and An-Naas (Qui a’udhu birabbin nas) and wiped those parts of the body that he could (wherever the hand could reach). He began with the head, then the face and then the front part of his body. This was done thrice”. Shama’il Muhammadiyah Book 38, Hadith 244
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