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:22401a –
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السيوطي:٢٢٤٠١a –

"مَنْ فُتِحَ لَهُ بَابٌ مِنَ الْخَير فَلْيَنْتَهِزْهُ، فَإِنَّهُ لا يَدْرِي مَتَى يُغْلَقُ عَنْه".  

ابن المبارك عن حكيم بن عمير مرسلًا، ابن شاهين عن عبد الله بن أَبان بن عثمان بن حذيفة بن أَوس عن أَبيه عن جده حذيفة

See similar narrations below:

Collected by Aḥmad's Zuhd
ahmad-zuhd:2335 – ʿAbdullāh from my father > Yaʿmur > ʿAbdullāh > Abū Bakr b. Abū Maryam al-Ghassānī > Ḥakīm b. ʿUmayr

[Machine] The Messenger of Allah ﷺ said, "Whoever is given an opportunity of goodness, let him seize it, for he does not know when it will be closed."  

الزهد لأحمد:٢٣٣٥ – حَدَّثَنَا عَبْدُ اللَّهِ حَدَّثَنِي أَبِي حَدَّثَنَا يَعْمُرُ حَدَّثَنَا عَبْدُ اللَّهِ أَنْبَأَنَا أَبُو بَكْرِ بْنُ أَبِي مَرْيَمَ الْغَسَّانِيُّ حَدَّثَنِي حَكِيمُ بْنُ عُمَيْرٍ

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ «مَنْ فُتِحَ لَهُ بَابٌ مِنَ الْخَيْرِ فَلْيَنْتَهِزْهُ فَإِنَّهُ لَا يَدْرِي مَتَى يُغْلَقُ»