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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:12886a –
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السيوطي:١٢٨٨٦a –

"تَمَامُ الرِّباطِ أَربعينَ يومًا؛ وَمَن رَابَط أَربعينَ يومًا لَمْ يَبِعْ، وَلَم يَشْتَر، وَلَمْ يُحْدِث حَدَثًا، خَرَج من ذُنُوبهِ كيوم وَلَدَتْهُ أُمُّهُ".  

[طب] الطبرانى في الكبير عن أَبى أُمامة

See similar narrations below:

Collected by Ṭabarānī
tabarani:7606 – Muḥammad b. ʿAbdullāh b. Bakr al-Sarrāj al-ʿAskarī > Ismāʿīl Ibrāhīm al-Tarjumānī > Ayyūb b. Mudrik > Makḥūl > Abū Umāmah > Rasūl Allāh Ṣallá

[Machine] The Messenger of Allah, ﷺ , said, "The perfect faithfulness is forty days. Whoever remains faithful for forty days without selling, buying, or engaging in new transactions, will be cleansed of his sins as if he were just born."  

الطبراني:٧٦٠٦ – حَدَّثَنَا مُحَمَّدُ بْنُ عَبْدِ اللهِ بْنِ بَكْرٍ السَّرَّاجِ الْعَسْكَرِيُّ ثنا إِسْمَاعِيلُ إِبْرَاهِيمَ التَّرْجُمَانِيُّ ثنا أَيُّوبُ بْنُ مُدْرِكٍ عَنْ مَكْحُولٍ عَنْ أَبِي أُمَامَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «تَمَامُ الرِّبَاطِ أَرْبَعِينَ يَوْمًا وَمَنْ رَابَطَ أَرْبَعِينَ يَوْمًا لَمْ يَبِعْ وَلَمْ يَشْتَرِ وَلَمْ يُحْدِثْ حَدَثًا خَرَجَ مِنْ ذُنُوبِهِ كَيَوْمِ وَلَدَتْهُ أُمُّهُ»