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:17865a
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السيوطي:١٧٨٦٥a

"لَوْ تَعْلَمُونَ مَا ادُّخِرَ لَكُمْ مَا حَزنْتُمْ عَلَى مَا زُوِيَ عَنكُمْ وَلَتُفْتَحَن عَلَيكم فَارِسُ والرُّومُ".  

[حم] أحمد عن العرباض

See similar narrations below:

Collected by Aḥmad, Suyūṭī
ahmad:17161al-Ḥakam b. Nāfiʿ > Ismāʿīl b. ʿAyyāsh > Ḍamḍam b. Zurʿah > Shurayḥ b. ʿUbayd

[Machine] Al-Arbaad bin Saariyah narrated that the Prophet ﷺ used to go out with us to the battlefield, and we would have walnuts with us. He would say, "If you only knew what we have stored for you, you would not be sad for what has been taken from you. And soon, you will conquer Persia and Rome."  

أحمد:١٧١٦١حَدَّثَنَا الْحَكَمُ بْنُ نَافِعٍ حَدَّثَنَا إِسْمَاعِيلُ بْنُ عَيَّاشٍ عَنْ ضَمْضَمِ بْنِ زُرْعَةَ عَنْ شُرَيْحِ بْنِ عُبَيْدٍ قَالَ قَالَ

الْعِرْبَاضُ بْنُ سَارِيَةَ كَانَ النَّبِيُّ ﷺ يَخْرُجُ إِلَيْنَا فِي الصُّفَّةِ وَعَلَيْنَا الْحَوْتَكِيَّةُ فَيَقُولُ لَوْ تَعْلَمُونَ مَا ذُخِرَ لَكُمْ مَا حَزِنْتُمْ عَلَى مَا زُوِيَ عَنْكُمْ وَلَيُفْتَحَنَّ لَكُمْ فَارِسُ وَالرُّومُ  

suyuti:464-5bal-ʿIrbāḍ b. Sāriyah
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السيوطي:٤٦٤-٥b

"عَنِ الْعِرْبَاضِ بْنِ سَارِيَةَ قَالَ: كَانَ النَّبِىُّ ﷺ يَخْرُجُ إِلَيْنَا يَوْمَ الْجُمُعَةِ فِى الصُّفَّةِ وَعَلَيْنَا الْحَوْتَكِيَّةُ فَيَقُولُ: أَمَا لَوْ تَعْلَمُونَ مَا دُخِر لَكُمْ مَا حَزنْتمْ عَلَى مَا زُوِىَ عَنْكُمْ، وَلَيُفْتَحَنَّ لَكُمْ فَارِسُ وَالرَّومُ".  

[كر] ابن عساكر في تاريخه الواقدى