‘Ikrima, on the authority of Ibn ‘Abbas, said the Prophet (ﷺ) forbade that the food of two people who were rivalling one another should be eaten. Abu Dawud transmitted it. Muhyi as-Sunna said the sound version is that it comes from ‘Ikrima from the Prophet (ﷺ) in <i>mursal</i> form.

وَعَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ: أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى عَنْ طَعَامِ الْمُتَبَارِيَيْنِ أَنْ يُؤْكَلَ. رَوَاهُ أَبُو دَاوُدَ وَقَالَ مُحْيِي السُّنَّةِ: وَالصَّحِيحُ أَنَّهُ عَنْ عِكْرِمَةَ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مُرْسَلًا