The Euphrates is soon to uncover a treasure of gold, but those who are present must not take any of it. (Using translation from Abū Dāʾūd 4313)
قَالَ رَسُولُ اللَّهِ ﷺ «يُوشِكُ الْفُرَاتُ أَنْ يَحْسُرَ عَنْ كَنْزٍ مِنْ ذَهَبٍ فَمَنْ حَضَرَهُ فَلَا يَأْخُذْ مِنْهُ شَيْئًا»