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.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
suyuti:10237a –
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السيوطي:١٠٢٣٧a –

"الإِيمانُ الصَّلاةُ فمن فَرَّغَ لهَا قَلْبَه وَحَافَظَ عَلَيهَا بحَدِّهَا وَوَقْتهَا وسُنَّتَهَا فَهُوَ مُؤْمِنٌ".  

ابن النجار عن أبي سعيد

See similar narrations below:

Collected by Suyūṭī
suyuti:15564a –
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السيوطي:١٥٥٦٤a –

"عِلمُ الإِيمَان الصَّلاةُ، فَمَن فَرَّغَ لَهَا قَلبَهُ، وَحَافَظَ عَلَيهَا بِحَدِّها وَوَقْتِهَا وَسُنَنِهَا فَهُوَ مُؤْمِنٌ".  

ابن شاهين في الأفراد، والخطيب، وقال: غريب جدا، وابن النجار والديلمى عن أبي سعيد