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:25059a –
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السيوطي:٢٥٠٥٩a –

"لَا تَعْجَبُوا بِعَمَلِ عَامِلٍ حَتَّى تَنْظُرُوا بمَا يُخْتَمُ لَهُ".  

[طب] الطبرانى في الكبير وابن النجار عن أبي أمامة

See similar narrations below:

Collected by Ṭabarānī
tabarani:8025 – Muḥammad b. Khālid al-Rāsibī > ʿAbd al-Wāḥid b. Ghiyāth > Faḍāl b. Jubayr > Abū Umāmah

[Machine] The Messenger of Allah ﷺ said, "Do not admire the act of a doer until you see what the outcome will be for him."  

الطبراني:٨٠٢٥ – حَدَّثَنَا مُحَمَّدُ بْنُ خَالِدٍ الرَّاسِبِيُّ ثنا عَبْدُ الْوَاحِدِ بْنُ غِيَاثٍ ثنا فَضَالُ بْنُ جُبَيْرٍ ثنا أَبُو أُمَامَةَ قَالَ

قَالَ رَسُولُ اللهِ ﷺ «لَا تَعْجَبُوا بِعَمَلِ عَامَلٍ حَتَّى تَنْظُرُوا بِمَا يُخْتَمُ لَهُ»