Selling gold for silver on credit is forbidden

I asked al-Bara b. Azib and Zayd b. Arqam ᴿᴬ about currency exchange. Each one of them would say, “This one is better than me,” and both of them said: The Messenger of Allah ﷺ forbade selling gold for silver on credit.

سَأَلْتُ الْبَرَاءَ بْنَ عَازِبٍ وَزَيْدَ بْنَ أَرْقَمَ ؓ عَنِ الصَّرْفِ، فَكُلُّ وَاحِدٍ مِنْهُمَا يَقُولُ: هَذَا خَيْرٌ مِنِّي، فَكِلاَهُمَا يَقُولُ: نَهَى رَسُولُ اللَّهِ ﷺ عَنْ بَيْعِ الذَّهَبِ بِالْوَرِقِ دَيْنًا.