ENOfficial
‘A'isha told that God’s messenger wanted to buy a young slave, so he threw some dates in front of him, but when the youth ate greedily he said, “Voracious eating is ominous,” and ordered him to be sent back. Baihaqi transmitted it in Shu‘ab al-iman.
Source: sunnah.com
Other translations
Arabic
عَنْ عَائِشَةَ أَنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ أَرَادَ أَنْ يَشْتَرِيَ غُلَامًا فَأَلْقَى بَيْنَ يَدَيْهِ تَمْرًا فَأَكَلَ الْغُلَامُ فَأَكْثَرَ فَقَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «إِنَّ كَثْرَةَ الْأَكْلِ شُؤْمٌ» . وَأَمَرَ بِرَدِّهِ. رَوَاهُ الْبَيْهَقِيُّ فِي شعب الْإِيمَان
sunnah.com