Ibn Rawahah assessed them (the amount of dates) at forty thousand wasqs, and when Ibn Rawahah gave them option, the Jews took the fruits in their possession and twenty thousand wasqs of dates were due from them. (Using translation from Abū Dāʾūd 3415)
أَنَّ الْيَهُودَ لَمَّا خَيَّرَهُمْ ابْنُ رَوَاحَةَ أَخَذُوا التَّمْرَ وَعَلَيْهِمْ عِشْرُونَ أَلْفَ وَسْقٍ»