From Anas: "The Prophet ﷺ prohibited that a man should drink while standing." (Qatadah said:) So it was said: "And eating ?" He (Anas) said: "That is worse."
أَنَّ النَّبِيَّ ﷺ نَهَى أَنْ يَشْرَبَ الرَّجُلُ قَائِمًا فَقِيلَ الأَكْلُ قَالَ ذَاكَ أَشَدُّ