Commercial Transactions (Kitab Al-Buyu)
23/14. Chapter:
Regarding Paying With Gold For A Price In Silver
Sunan Abi Dawud
حَدَّثَنَا حُسَيْنُ بْنُ الأَسْوَدِ، حَدَّثَنَا عُبَيْدُ اللَّهِ، أَخْبَرَنَا إِسْرَائِيلُ، عَنْ سِمَاكٍ، بِإِسْنَادِهِ وَمَعْنَاهُ وَالأَوَّلُ أَتَمُّ لَمْ يَذْكُرْ " بِسِعْرِ يَوْمِهَا " .
The tradition mentioned above has also been transmitted by Simak (b. Harb) with a different chain of narrators and to the same effect. The first version is more perfect. It does not mention the words "at the current rate".
Reference : Sunan Abi Dawud 3355In-book reference : Book 23, Hadith 30English translation : Book 22, Hadith 3349