"The Messenger of Allah said: 'Gold for gold, weight for weight, like for like; and silver for silver, weight for weight, like for like. Whoever gives more or takes more has engaged in Riba."' (Using translation from Nasāʾī 4569)
عَنِ النَّبِيِّ ﷺ قَالَ الْفِضَّةُ بِالْفِضَّةِ مِثْلًا بِمِثْلٍ وَزْنًا بِوَزْنٍ وَالذَّهَبُ بِالذَّهَبِ وَزْنًا بِوَزْنٍ مِثْلًا بِمِثْلٍ فَمَنْ زَادَ فَهُوَ رِبًا