Hadith on Quran: Surat al-Ikhlas is one-third, al-Kafirun is one-forth

Abdullah ibn Umar reported: The Messenger of Allah, peace and blessings be upon him, said, “The chapter, ‘Say: He is Allah the One,’ (112:1) is equal to one-third of the Quran. The chapter, ‘Say: O unbelievers,’ (109:1) is equal to one-fourth of the Quran.” The Prophet would recite either of them in his two cycles before dawn prayer.

In another narration, Ibn Umar said, “The Prophet would recite them in the two cycles before dawn prayer and the two cycles after sunset prayer.”

Source: al-Mu’jam al-Kabīr 13319

Grade: Sahih li ghayrihi (authentic due to external evidence) according to Al-Albani

عَنِ ابْنِ عُمَرَ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قُلْ هُوَ اللَّهُ أَحَدٌ تَعْدِلُ ثُلُثَ الْقُرْآنِ وَ قُلْ يَأَيُّهَا الْكَافِرُونَ تَعْدِلُ رُبْعَ الْقُرْآنِ وَكَانَ يَقْرَأُ بِهِمَا فِي رَكْعَتَيِ الْفَجْرِ

وفي رواية أخرى قال قَرَأَ فِي الرَّكْعَتَيْنِ قَبْلَ الْفَجْرِ وَالرَّكْعَتَيْنِ بَعْدَ الْمَغْرِبِ

13319 المعجم الكبير للطبراني باب التاء باب

583 المحدث الألباني خلاصة حكم المحدث صحيح لغيره في صحيح الترغيب