[Machine] At first, he did not call it "capital", then he called it that when discussing it. Similarly, what was narrated from Ibn Umar about it, and Allah knows best.
بِدَهْ دُو ازْدَهْ لَمْ يُسَمِّ رَأْسَ الْمَالِ ثُمَّ سَمَّاهُ عِنْدَ النَّقْدِ وَكَذَلِكَ مَا رُوِيَ عَنِ ابْنِ عُمَرَ فِي ذَلِكَ وَاللهُ أَعْلَمُ