وَعَنْ عِكْرِمَةَ عَنِ ابْنِ عَبَّاسٍ
أَنَّ النَّبِيَّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى عَنْ طَعَامِ الْمُتَبَارِيَيْنِ أَنْ يُؤْكَلَ
The Prophet (sallallahu alayhi wa sallam) 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 (sallallahu alayhi wa sallam) in mursal form.
Mishkat al-Masabih 3098, Book 14, Marriage, Hadith 143. 1 min read