Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
suyuti:22822a
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السيوطي:٢٢٨٢٢a

"مَنْ قَرَأَ {قُلْ هُوَ اللَّهُ أَحَدٌ} مَرَّةً وَاحِدَةً فكَأَنَّمَا قَرَأَ ثُلُثَ القُرآنِ، وَمَنْ قَرَأَها مَرَّتَين فَكَأَنَّمَا قَرَأَ ثُلُثَى القُرآنِ، وَمَنْ قَرَأَها ثَلاثًا فَكَأَنَّمَا قَرَأَ القُرآنَ كلَّهُ".  

الرافعي عن علي

See similar narrations below:

Collected by Suyūṭī
suyuti:22814a
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السيوطي:٢٢٨١٤a

"مَنْ قرأَ {قُلْ يَا أَيُّهَا الْكَافِرُونَ} فَكَأَنَّمَا قَرَأَ رُبع القُرآنِ، وَمَنْ قَرَأَ {قُلْ هُوَ اللَّهُ أَحَدٌ} فَكَأَنَمَا قَرَأَ ثُلُثَ القُرآنِ".  

[هب] البيهقى في شعب الإيمان عن سعد